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How to repair and restore Windows 10

So Windows 10 won't load. Or maybe it starts up, but crashes a lot. Either way, you need to fix the problem before you can use your laptop. If your screen is rotated, we have an easy fix for that. If the operating system is booting slower than molasses, you can also use power settings to speed up its launch. Otherwise, here are a few ways to repair Windows 10.

Method 1: Use Windows Startup Repair

If Windows 10 is unable to boot up and takes you to the login screen or the desktop, your first step should be to use Startup Repair. Here's how:

1. Navigate to the Windows 10 Advanced Startup Options menu. On many laptops, hitting F11 as soon as you power on will get you to the Windows 10 Advanced Startup Options. Booting off an install disk and hitting Next then Repair offers a secondary option.

Once your computer has booted, select Troubleshoot.

And then you'll need to click Advanced options.

2. Click Startup Repair.

Windows will take anywhere from a few seconds to a few minutes to attempt to fix the problem. (It may not be able to.) If you don't actually have a startup problem, it will also say it can't fix the problem.

Method 2: Use Windows Restore

1. Complete step 1 from the previous method to get to Windows 10's Advanced Startup Options menu.

2. Click System Restore.

The computer will reboot.

3. Select your username.

4. Enter your password.

5. Select a restore point from the menu and follow the prompts. (If you have no restore points, you can't use this method.)

Method 3: Perform a Disk Scan

Your Windows 10 problems may stem from a corrupt file. If you can boot into the operating system — even if you have to boot into safe mode — you should perform a file scan to check for problems. 

1. Type "cmd" into the main search box.

2. Right click on Command Prompt and select Run as Administrator.

3. Type sfc /scannow at command prompt and hit Enter.

The scan will take a while; it should fix any corrupted files it finds.

Method 4: Reset Windows 10

If you want to get a clean start, free from rogue software and drivers, you usually don't need to do a full install. Instead, Windows 10 provides a built-in reset feature which takes your computer back to the way it was before you had any software, special devices or data preloaded. (On a side note, if you're giving your computer to someone else, resetting is a good way to wipe it.) 

See our tutorial on how to reset Windows 10 to refresh your PC.

Method 5: Reinstall Windows 10 from scratch

If all else fails and you can't even reset your Windows computer, you can reinstall the OS entirely. You won't even need an activation number or any proof of purchase, either. Just make sure you have more than 4GB of space available, as that's how much space the file you'll download takes up. Here's how to reinstall Windows 10:

1. Visit this page and click Download tool now.

2. Click on the download link at the bottom of your screen.

3. Click Accept.

4. Select Create installation media for another PC and click Next.

7. Select ISO file and click Next.

7. Click Finish.

7. Open the Windows ISO file you downloaded.

8. Open Setup.

9. Click Next.

10. Click Accept. Be prepared to wait; this next part may take a while.

11. Click Install. Again, this will take a moment while your system restarts.

12. Wait for your system to restart and install Windows 10.

You've reinstalled Windows 10! We hope this guide fixed your problems. Check out the table of contents below for more fixes.

Windows 10 annoyances and problems

Sours: https://www.laptopmag.com/articles/repair-windows-10

If your Windows PC is throwing an error message at you before it even begins to load Windows, it’s possible that the boot sector on your system partition is damaged, corrupted, or has missing files. Here’s how to troubleshoot those problems.

What Are the Boot Sector and Master Boot Record?

RELATED:What's the Difference Between GPT and MBR When Partitioning a Drive?

The boot sector is a small section at the beginning of a hard drive that gets created whenever you format the drive. The boot sector contains some code and data that helps BIOS hand off control of the startup process to Windows. The boot sector also hosts the Master Boot Record (MBR), which contains the disk signature, partition table for the disk, and a small bit of code called the master boot code.

When a PC starts, the initial power-on routine is handled by the BIOS. The BIOS then loads the master boot code into the PC’s RAM and hands off the startup processes to it. The master boot code scans the partition table, determines the active partition, loads a copy of the boot sector into the PC’s RAM, and hands off the startup process to that code. It’s this boot strapping process that allows the initial bits of the Windows code to start loading.

The boot sector can experience the same types of problems as any other part of your hard drive—missing files, corrupted files, and even physical damage. When the boot loader process fails, it will happen after you see the BIOS information but before Windows actually begins to load. You’ll usually see error messages like the following:

  • Error loading operating system
  • Missing operating system
  • Reboot and select proper boot device
  • Invalid partition table
  • Bootmgr is missing
  • FATAL: No bootable medium found! System halted.

If you are seeing any of these messages, it means you won’t be able to start Windows and will have to use the Windows Recovery Environment to do your troubleshooting. We’re here to walk you through that.

Note: If your PC starts to load Windows, but then fails, then the bootloader is not the problem. Instead, you should try starting the PC in Safe Mode and troubleshooting from there. Performing a System Restore would be a good place to start.

RELATED:How to Use Safe Mode to Fix Your Windows PC (and When You Should)

Boot From the Windows Installation Media or Recovery Partition

The first thing you’ll need to do is start your PC into the Windows Recovery Environment. It’s possible that your PC has a special recovery partition that will allow you to start the Windows Recovery Environment without needing a physical disc. How you do that varies with what brand of PC you own, but you’ll often see a message during startup telling you what key to press to start recovery and repair. If your PC doesn’t have a recovery partition—or you’re just not sure how to access it—you can also start your PC using a DVD or USB with the Windows installer on it.

If you don’t have an installation disc, you’ll have to use another PC to download a copy of Windows. You can then create a DVD or USB install disc that you can use to boot your own PC. And by the way, if your PC is still operational you might want to take the precautionary step of creating a recovery drive or system repair disc that you can use in the future.

RELATED:Where to Download Windows 10, 8.1, and 7 ISOs Legally

If you start your PC using an installation disc, click through until you see the initial Windows installation screen and then click the “Repair your computer” link instead of starting an installation. If you’re starting from a recovery partition or repair disc, the screens might look a little different, but you’ll end up at the same options we’re going to cover here.

Windows will then load the recovery environment. On the first page, click the “Troubleshoot” option.

The Advanced Options page will appear next and it contains the options we’ll be discussing in the next couple of sections.

Note that if you’re using Windows 7, the screens may look a bit different. You’ll see most of the same options, though, including the ones we’re going to cover next.

Repair Startup Automatically

In most cases, you should let Windows try to automatically repair startup. Not only will it attempt to fix the Master Boot Record or recreate the boot sector, it will scan for and try to fix other common startup problems as well. On the Advanced Options page, click “Startup Repair.”

The next page displays all operating systems detected on your PC—even if you only have one installed. Click the operating system you want to repair.

Windows will begin checking for startup problems and attempting repairs.

When the process is complete, Windows will let you know whether the repairs were successful. Either way, you’ll be given the option to restart your PC or return to the Advanced Options page.

If Windows cannot automatically repair your PC, you can always try repairing the Master Boot Record or rebuilding the boot sector manually from the Command Prompt. It’s unlikely it will work if the automatic repair didn’t, since these commands are performed as part of the automatic repair process, but it won’t hurt to try.

Repair the Master Boot Record from the Command Prompt

If you prefer handling things yourself—or an automatic repair failed—and you’re pretty sure that the problem is with your Master Boot Record or boot sector, you can also drop to the Command Prompt for a quick fix. On the Advanced Options page, click “Command Prompt.”

Once you’re at the Command Prompt, you’ll be using the command, and there are a couple of options that can be useful in fixing bootloader errors.

To restore the Master Boot Record, type the following command and hit Enter. This command writes a new Windows-compatible Master Boot Record (based on whatever version of Windows you’re using) to the boot sector without overwriting the existing partition table. It’s a good start for repairing boot loader errors resulting from file corruption.

bootrec /fixmbr

To write a whole new boot sector to the system partition instead, type the following command and hit Enter. This option does overwrite the current partition table and thus can sometimes cause issues if you’re set up to boot to multiple operating systems. It won’t overwrite any data on your actual partitions, but you may need to reconfigure your multi-boot options after using this command. This command is useful when you suspect your boot sector may have been overwritten by another operating system installation or malware, or if you suspect the boot sector itself is damaged.

bootrec /fixboot

And of course, the bootrec tool also offers other more advanced options. You can always type to see more options for and get help with the command.

Steps to Take After Recovery

After you’ve successfully repaired your PC and are able to start Windows, we highly recommend going ahead and performing a couple of other steps. First, run the Check Disk utility to scan the integrity of your file system and hard disk. It’s always possible that your bootloader error stemmed from physical problems with your hard disk.

Second, use the System File Checker utility to scan for and fix any corrupted system files. It’s unlikely that using the steps we’ve talked about will cause problems with system files, but it is possible. And it’s a very easy thing to check on and fix.

RELATED:How to Fix Hard Drive Problems with Chkdsk in Windows 7, 8, and 10


While boot loader errors can be a bit intimidating when they pop up—mostly because of how little information you’re given when they happen—they are reasonably easy to repair. You just have to know what to look out for and have a recovery solution ready to load.

Sours: https://www.howtogeek.com/howto/32523/how-to-manually-repair-windows-7-boot-loader-problems/
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How to repair the EFI bootloader on a GPT HDD for Windows 7, 8, 8.1 and 10

This article provides information about how to resolve an issue with the EFI Bootloader not booting correctly on a GPT Hard Disk Drive for a number of Windows Operating Systems.


Table of Contents:

  1. Introduction
  2. How to repair your EFI Bootloader
  3. How to repair your MBR (Master Boot Record) - Legacy Machines
  4. What to do if you are still unable to boot into Windows

Introduction

Most people with boot issues on Windows Operating Systems (OS) will choose to reinstall the OS rather than attempt to fix the boot issue itself.

This particular article deals with running a repair of the EFI (Extensible Firmware Interface) bootloader on a GPT (GUID (Globally Unique Identifiers) Partition Table) Hard Disk Drive.

This will only work for those OSs installed on a UEFI (Unified Extensible Firmware Interface) BIOS (Basic Input / Output System).

Note: Replace any  with the appropriate values found on your machine, do not keep the


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How to repair your EFI Bootloader

Windows 7, 8 and 8.1 could install on a Legacy BIOS using MBR. However Windows 8, 8.1 and 10 were designed to install on the UEFI BIOS using the EFI bootloader and GPT.

Note: Any repairs done to the root of a hard drive, has the possibility that the repair may go wrong. This means you would lose any data on the drive that is not previously backed up. Best Practice is always to have performed a full backup of a drive before you work on it or it's operating system.

The GPT structure deals with a lot of the problems that the Bootsect command was designed to remedy in MBR. However if you find yourself in need of repairing the EFI bootloader, you can follow the instructions below:

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Windows 7

If you do have the Installation Media :

  1. Insert the Media (DVD/USB) in your PC and restart.

  2. Boot from the media.

  3. Select Repair Your Computer.

  4. Select the operating system and click next.

  5. Choose Command Prompt from the menu :

    1. Type and run the command :

      diskpart
    2. Type and run the command :

      sel disk 0
    3. Type and run the command :

      list vol
  1. Verify that the EFI partition (EPS - EFI System Partition) is using the FAT32 file system and assign a drive letter to it (Assign a letter that isn't already in use.):

    1. Type and run the command :

      sel vol <number of volume>
    2. Type and run the command :

      assign letter=<drive letter>:
    3. Type and run the command :

      exit
  1. In order to repair the boot record :

    1. Type and run the command :

      cd /d <drive letter>:\EFI\Microsoft\Boot\
    2. Type and run the command :

      bootrec /FixBoot

If you don't have the Installation Media :

  1. Restart your PC

  2. Tap rapidly on the <F8> key once the PC has turned on, but before the Windows Splash Screen appears.

  3. Select Repair your computer from the menu that appears.

  4. Select Command Prompt from the Recovery Options :

    1. Type and run the command :

      diskpart
    2. Type and run the command :

      sel disk 0
    3. Type and run the command :

      list vol
  1. Verify that the EFI partition (EPS - EFI System Partition) is using the FAT32 file system and assign a drive letter to it (Assign a letter that isn't already in use.):

    1. Type and run the command :

      sel vol <number of volume>
    2. Type and run the command :

      assign letter=<drive letter>:
    3. Type and run the command :

      exit
  1. In order to repair the boot record :

    1. Type and run the command :

      cd /d <drive letter>:\EFI\Microsoft\Boot\
    2. Type and run the command :

      bootrec /FixBoot

The next step is the same across all the operating systems at this point :

  1. Rebuild the BCD store

  2. First run the command below to backup the old BCD :

    ren BCD BCD.old
  3. Now recreate it using this command :

    bcdboot c:\Windows /l en-us /s <boot letter>: All

Note: If you are creating boot entries on an attached USB Flash or other external drive add /f between the : and the ALL. Please remember that the <boot letter> is replaced with whatever the letter of the drive you are booting from is. (ie. C:\, D:\)


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Windows 8 and 8.1

If you do have the Installation Media :

  1. Insert the Media (DVD/USB) in your PC and restart.

  2. Boot from the media.

  3. Select Repair Your Computer.

  4. Select Troubleshoot.

  5. Choose Command Prompt from the menu :

    1. Type and run the command :

      diskpart
    2. Type and run the command :

      sel disk 0
    3. Type and run the command :

      list vol
  1. Verify that the EFI partition (EPS - EFI System Partition) is using the FAT32 file system and assign a drive letter to it (Assign a letter that isn't already in use.):

    1. Type and run the command :

      sel vol <number of volume>
    2. Type and run the command :

      assign letter=<drive letter>:
    3. Type and run the command :

      exit
  1. In order to repair the boot record :

    1. Type and run the command :

      cd /d <drive letter>:\EFI\Microsoft\Boot\
    2. Type and run the command :

      bootrec /FixBoot

If you don't have the Installation Media :

  1. Restart your PC

  2. Tap rapidly on the <F8> key once the PC has turned on, but before the Windows Splash Screen appears.

    Please be aware this may take several attempts. The timing for this option was shortened significantly from that in Windows 7.

  3. Select Repair your computer from the menu that appears.

  4. Select Command Prompt from the Troubleshoot screen :

    1. Type and run the command :

      diskpart
    2. Type and run the command :

      sel disk 0
    3. Type and run the command :

      list vol
  1. Verify that the EFI partition (EPS - EFI System Partition) is using the FAT32 file system and assign a drive letter to it (Assign a letter that isn't already in use.):

    1. Type and run the command :

      sel vol <number of volume>
    2. Type and run the command :

      assign letter=<drive letter>:
    3. Type and run the command :

      exit
  1. In order to repair the boot record :

    1. Type and run the command :

      cd /d <drive letter>:\EFI\Microsoft\Boot\
    2. Type and run the command :

      bootrec /FixBoot

The next step is the same across all the operating systems at this point :

  1. Rebuild the BCD store

  2. First run the command below to backup the old BCD :

    ren BCD BCD.old
  3. Now recreate it using this command :

    bcdboot c:\Windows /l en-us /s <boot letter>: All

Note: If you are creating boot entries on an attached USB Flash or other external drive add /f between the : and the ALL. Please remember that the <boot letter> is replaced with whatever the letter of the drive you are booting from is. (ie. C:\, D:\)


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Windows 10

If you do have the Installation Media :

  1. Insert the Media (DVD/USB) in your PC and restart.

  2. Boot from the media.

  3. Select Repair Your Computer.

  4. Select Troubleshoot.

  5. Select Advanced Options.

  6. Choose Command Prompt from the menu :

    1. Type and run the command :

      diskpart
    2. Type and run the command :

      sel disk 0
    3. Type and run the command :

      list vol
  1. Verify that the EFI partition (EPS - EFI System Partition) is using the FAT32 file system and assign a drive letter to it (Assign a letter that isn't already in use.):

    1. Type and run the command :

      sel vol <number of volume>
    2. Type and run the command :

      assign letter=<drive letter>:
    3. Type and run the command :

      exit
  1. In order to repair the boot record :

    1. Type and run the command :

      cd /d <drive letter>:\EFI\Microsoft\Boot\
    2. Type and run the command :

      bootrec /FixBoot

If you don't have the Installation Media :

  1. Restart your PC

  2. Tap rapidly on the <F8> key once the PC has turned on, but before the Windows Splash Screen appears.

    Please be aware this may take several attempts. The timing for this option was shortened significantly from that in Windows 7.

  3. Select Repair your computer from the menu that appears.

  4. Select Command Prompt from the Advanced Options tab in the Troubleshoot screen :

    1. Type and run the command :

      diskpart
    2. Type and run the command :

      sel disk 0
    3. Type and run the command :

      list vol
  1. Verify that the EFI partition (EPS - EFI System Partition) is using the FAT32 file system and assign a drive letter to it (Assign a letter that isn't already in use.):

    1. Type and run the command :

      sel vol <number of volume>
    2. Type and run the command :

      assign letter=<drive letter>:
    3. Type and run the command :

      exit
  1. In order to repair the boot record :

    1. Type and run the command :

      cd /d <drive letter>:\EFI\Microsoft\Boot\
    2. Type and run the command :

      bootrec /FixBoot

The next step is the same across all the operating systems at this point :

  1. Rebuild the BCD store

  2. First run the command below to backup the old BCD :

    ren BCD BCD.old
  3. Now recreate it using this command :

    bcdboot c:\Windows /l en-us /s <boot letter>: All

Note: If you are creating boot entries on an attached USB Flash or other external drive add /f between the : and the ALL. Please remember that the <boot letter> is replaced with whatever the letter of the drive you are booting from is. (ie. C:\, D:\)


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How to repair your MBR (Master Boot Record)

These steps apply to any legacy drive used as a boot drive on any recent Windows Operating system.

  1. Using the F12 key at the Splash screen to enter a menu that lets you boot from the Windows installation media or a bootable disc or flash drive.

  2. Click on the Repair your Computer link at the bottom of the Install Now screen.

  3. Click on Troubleshoot

  4. Select Command Prompt

  5. Enter the following three commands in turn, following each by pressing the Enter key:

    bootrec /fixmbr
    bootrec /fixboot
    bootrec /rebuildbcd
  6. Restart the PC with the installation media removed to check if the repair worked

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What to do if you are still unable to boot into Windows

If you have attempted to perform the steps above, you will need to locate and install a new, fresh copy of Windows onto your machine, keeping the same partition structure as before.

After completing the fresh installation, you will need to boot into the DRBoot disk, and restore only your "C:" and any User Data partitions inside of your Image Backup, one partition at a time, instead of the entire disk.

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Most of the contents of this article originated here

Sours: https://support.novastor.com/hc/en-us/articles/360011403653-How-to-repair-the-EFI-bootloader-on-a-GPT-HDD-for-Windows-7-8-8-1-and-10

Fix the MBR – Guide for Windows XP, Vista, 7, 8, 8.1, 10

This guide shows you how to fix the Master boot record (MBR) in any of the Windows versions: Windows XP, Vista, 7, 8, 8.1 or 10.

Contents

What is the MBR

The MBR (stands for “Master boot record”) is a boot sector (a region of your hard disk) that holds information about the partitions of your hard drive and acts as a loader for the operating system you’re running.

The Master boot record is created when you first install Windows, on the first partition you create. It’s the first 512 bytes of your hard disk.

If the MBR is damaged, you won’t be able to boot into Windows. All Windows versions – Windows XP, Vista, 7 or 8 – use MBR and, if damaged you won’t be able to boot.

It can be damaged by certain viruses that target the MBR to replace it with their own code or in cases when you dual boot with a Linux distribution (see Error: no such partition. Grub rescue article).

Backup

You can backup the MBR since it’s stored on the hard disk and you restore it later, when needed.

You only need one command to backup the MBR:

dd if=/dev/sda of=/path-to-save/mbr-backup bs=512 count=1

In the above command, is the path where you want to save .

Restore

Important: Restoring your Master boot record with the wrong partition table will make your data unreadable and will make it very hard to recover your data later.

You can restore the saved Master boot record using this command:

dd if=/path-to-get/mbr-backup of=/dev/sda bs=512 count=1

In this command, is the path where you have the stored.

Common errors

If the Master boot record is broken, your computer may show some of the following errors:

The "Error loading operating system" error

The “Error loading operating system” error

The "Operating system not found" error

The “Operating system not found” error

The "Invalid partition table" error

The “Invalid partition table” error

The "No bootable medium found" error

The “No bootable medium found” error

The Reboot and Select proper boot device error

The Reboot and Select proper boot device error

Other errors can be shown, depending on many factors, that are caused by a damaged boot record.

Fix the MBR with Easy Recovery Essentials

Easy Recovery Essentials, our bootable recovery and repair CD/USB, is guaranteed to repair most damages done to the Master boot record (MBR) using its Automated Repair feature for Windows XP, Vista, 7 or 8:

  1. Download Easy Recovery Essentials. Choose your Windows version (XP, Vista, 7 or 8) before downloading.
  2. Burn the image. Follow these instructions on how to burn the bootable ISO image very carefully, as making a bootable CD can be tricky!
  3. Boot Easy Recovery Essentials
  4. Choose Automated Repair option and click Continue
    Easy Recovery Essentials

    Choose “Automated Repair” in Easy Recovery Essentials

  5. Choose your Windows installation drive’s letter (usually it’s ) and click on Automated Repair
  6. Easy Recovery Essentials will now begin
    Easy Recovery Essentials

    Easy Recovery Essentials Starts the Process

  7. Once the process is complete, click Restart
  8. Done. Windows XP, Windows Vista, Windows 7 or Windows 8 should properly load now.
    Windows XP, Vista, 7, 8 Boot Screens

    Windows XP, Vista, 7, 8 Loading Successfully

You can download Easy Recovery Essentials from here.

Fix the MBR in Windows XP

Windows XP users can use the command to repair the MBR. You need the original Windows XP installation CD to run Recovery Console and run the fixmbr utility.

If you don’t have the Windows XP installation CD to run Recovery Console, go to Fix MBR with Easy Recovery Essentials.

The fixmbr command is only available for Windows XP and Windows 2000.

The instructions to run fixmbr are:

    1. Boot from the Windows XP CD
    2. At the “Press any key to boot from CD…” message, press any key to boot into the CD
    3. When the Welcome to Setup screen appears, press to open Recovery Console

 

Windows XP Press R for Recovery Console

Windows XP Press R for Recovery Console

 

  1. At the “Which Windows installation would you like to log onto” question, type and hit , if your Windows XP is the only operating system on your hard drive
  2. At the “Type the Administrator password” question, enter the password and hit afterwards
  3. Type
    The fixmbr in Command Prompt

    The fixmbr in Command Prompt

    If the “Are you sure you want to write a new MBR?” message appears, press and hit

  4. Press
  5. Wait for the process to finish. The fixmbr utility software will repair any damage to the master boot record.
  6. Remove the Windows XP CD
  7. Type
  8. Press to restart your computer

If you weren’t able to boot your computer because of a damaged MBR, the above instructions should fix it and your Windows XP should start normally.

If the fixmbr command doesn’t work, try using the map command to get the correct drive name where you want to repair the Master boot record:

  1. Type
  2. Hit
  3. Wait for the output of the map utility: C: NTFS 1024MB \Device\Harddisk0\Partition1 E: \Device\CdRom0

    The above output is an example. The output for your computer can be different, but note the drive letter for the item with , in this case .

 

Fix the MBR in Windows Vista

Windows Vista uses a different utility to fix the MBR than XP does, the command.

You need your original Windows Vista installation CD/DVD to run the bootrec utility.

If you don’t have the Windows Vista installation CD/DVD to run Command Prompt, go to Fix MBR with Easy Recovery Essentials.

The instructions are:

  1. Boot from your Windows Vista installation CD or DVD
  2. Choose your language and keyboard layout
  3. At the Welcome screen, click on Repair your computer
    Windows Vista Repair Your Computer Menu

    Windows Vista Repair Your Computer Menu

  4. Choose the operating system and click Next
  5. When the System Recovery Options window appears, click on Command Prompt
  6. When Command Prompt appears, type these commands: bootrec /FixMbr bootrec /FixBoot bootrec /RebuildBcd

    You can type for a full description of above commands.

  7. Press after each command
  8. Wait for the operation to finish. If it was a success, a confirmation message will appear on the screen.
  9. Remove the CD/DVD from the disk tray
  10. Type
  11. Hit and restart your computer

You can run Startup Repair for Windows Vista before running bootrec.exe to try and fix the boot error automatically. The steps to run Startup Repair are:

  1. Boot from the installation CD/DVD
  2. Click on Repair your computer, after you select the language and keyboard layout
    Windows Vista Repair Your Computer Menu

    Windows Vista Repair Your Computer Menu

  3. Choose your operating system from the list, click Next
  4. When the System Recovery Options dialog appears, click on Startup Repair
    Windows Vista System Recovery Options

    Windows Vista System Recovery Options

  5. Wait for the process to finish. Restart your computer when prompted by the system

Another alternative is to completely rebuild the BCD, if the bootrec /rebuildbcd command doesn’t work. When you are at the Command Prompt, type the following commands:

bcdedit /export C:\bcdbackup c: cd boot attrib bcd -s -h -r ren c:\boot\bcd bcd.backup bootrec /rebuildbcd

After each command, hit .

Fix the MBR in Windows 7

You need your original Windows 7 installation DVD to boot into System Recovery Options and run Command Prompt.

If you don’t have the Windows 7 installation CD/DVD to run Command Prompt, go to Fix MBR with Easy Recovery Essentials.

The instructions are:

  1. Boot from the Windows 7 installation DVD
  2. At the “Press any key to boot from CD or DVD…”, press any key to boot from the DVD
  3. Select a language
  4. Select a keyboard layout
  5. Click Next
  6. Select the operating system and click Next. The “Use recovery tools that can help fix problems starting Windows” must be checked when you select the operating system.
  7. At the System Recovery Options screen, click on Command Prompt
    Windows 7 System Recovery Options Screen

    Windows 7 System Recovery Options Screen

  8. When Command Prompt successfully loads, type this command: bootrec /rebuildbcd
  9. Press
  10. Type the next command: bootrec /fixmbr
  11. Press
  12. Type the next command: bootrec /fixboot
  13. Press
  14. Remove the installation DVD from the disk tray and restart your computer

If and doesn’t work, try restoring the boot sector code of your Windows 7:

  1. Determine the drive letter of your Windows installation CD/DVD by typing these commands in the Command Prompt: diskpart select disk 0 list volume
  2. Look for the “CD-ROM” word in a “Type” column. This item is your CD/DVD installation drive letter. If the drive letter is , type these commands: exit D: cd boot dir

    If the drive letter is different than D:\, replace the second command with the drive letter you have noted from the previous list volume command.

  3. Type this command: bootsect /nt60 SYS /mbr
  4. Press
  5. Remove the CD/DVD from the disk tray
  6. Type
  7. Press to restart your computer

Fix the MBR in Windows 8 or 8.1

You need the original Windows 8 or 8.1 installation DVD to repair the Master boot record.

If you don’t have the Windows 8/8.1 installation CD/DVD to run Command Prompt, go to Fix MBR with Easy Recovery Essentials.

The instructions are:

  1. Boot from the original installation DVD (or the recovery USB)
  2. At the Welcome screen, click Repair your computer
    Windows 8 Repair Your Computer Menu

    Windows 8 Repair Your Computer Menu

  3. Choose Troubleshoot
  4. Choose Command Prompt
  5. When the Command Prompt loads, type the following commands: bootrec /FixMbr bootrec /FixBoot bootrec /ScanOs bootrec /RebuildBcd
  6. Press after each command and wait for each operation to finish
  7. Remove the DVD from the disk tray
  8. Type
  9. Hit
  10. Restart your computer and check if Windows 8/8.1 can now boot

If bootrec utility doesn’t fix your Windows 8/8.1, try following the next commands to fix the EFI bootloader of the Windows 8/8.1:

  1. Boot from the installation DVD or the Windows 8 or Windows 8.1 recovery USB
  2. Click Repair your computer
  3. Choose Troubleshoot
  4. Choose Command Prompt
  5. Type these commands in order and hit after each: diskpart sel disk 0 list vol

    These commands will select the first disk of your computer and the list all the partitions available on that disk.

  6. Check for the volume item that has the Fs column FAT32. The EFI partition must be formatted under FAT32. If the volume number of EFI partition is “2”, type the following command: sel vol 2

    If the volume number is different than 2, replace “2” with the number available on your computer.

  7. Assign a letter to this partition, a letter that is different that those already available on your computer, for example . Type this command to assign the letter: assign letter=x:
  8. Wait for the success message to appear: DiskPart successfully assigned the drive letter or mount point.
  9. Type to quit the DiskPart utility: exit
  10. Type this command and replace x:\ with the letter you assigned earlier to the EFI partition: cd /d x:\EFI\Microsoft\Boot\
  11. Then type the bootrec command to repair the volume: bootrec /fixboot
  12. Now you need to backup the old BCD and recreate a new one. Type: ren BCD BCD.backup
  13. Type this command to recreate the BCD and replace the x:\ with the assigned letter earlier: bcdboot c:\Windows /l en-us /s x: /f ALL
  14. In above command, Windows is installed on . If the drive letter where your Windows 8/8.1 is installed is different, replace c:\ with your drive letter.
  15. Remove the DVD from the disk tray
  16. Type
  17. Restart your computer
Windows 8 bootrec utility results screen

Windows 8 bootrec utility results screen

Fix the MBR in Windows 10

You need the original Windows 10 installation DVD to repair the Master boot record.

If you don’t have the Windows 10 installation DVD to run Command Prompt, go to Fix MBR with Easy Recovery Essentials.

The instructions are:

  1. Boot from the original installation DVD (or the recovery USB)
  2. At the Welcome screen, click Repair your computer
  3. Choose Troubleshoot
  4. Choose Command Prompt
  5. When the Command Prompt loads, type the following commands: bootrec /FixMbr bootrec /FixBoot bootrec /ScanOs bootrec /RebuildBcd
    Windows 10 Repair Your Computer Menu

    Windows 10 Repair Your Computer Menu

  6. Press after each command and wait for each operation to finish
  7. Remove the DVD from the disk tray
  8. Type
  9. Hit
  10. Restart your computer and check if Windows 10 can now boot

If bootrec utility doesn’t fix your Windows 10 installation, try following the next commands to fix the EFI bootloader:

    1. Boot from the installation DVD or the Windows 10 setup or recovery USB
    2. Click Repair your computer
    3. Choose Troubleshoot
    4. Choose Command Prompt
    5. Type these commands in order and hit after each: diskpart sel disk 0 list vol

      These commands will select the first disk of your computer and the list all the partitions available on that disk.

    6. Check for the volume item that has the Fs column FAT32. The EFI partition must be formatted under FAT32. If the volume number of EFI partition is “2”, type the following command: sel vol 2

      If the volume number is different than 2, replace “2” with the number available on your computer.

    7. Assign a letter to this partition, a letter that is different that those already available on your computer, for example . Type this command to assign the letter: assign letter=x:
    8. Wait for the success message to appear: DiskPart successfully assigned the drive letter or mount point.
    9. Type to quit the DiskPart utility: exit
    10. Type this command and replace x:\ with the letter you assigned earlier to the EFI partition: cd /d x:\EFI\Microsoft\Boot\
    11. Then type the bootrec command to repair the volume: bootrec /fixboot
    12. Now you need to backup the old BCD and recreate a new one. Type: ren BCD BCD.backup
    13. Type this command to recreate the BCD and replace the x:\ with the assigned letter earlier: bcdboot c:\Windows /l en-us /s x: /f ALL
    14. In above command, Windows is installed on . If the drive letter where you have Windows 10 installed is different, replace c:\ with your drive letter.
  1. Remove the DVD from the disk tray
  2. Type
  3. Restart your computer
Windows 10 bootrec utility results screen

Windows 10 bootrec utility results screen

More Information

Support Links

Applicable Systems

This Windows-related knowledgebase article applies to the following operating systems:

  • Windows XP (all editions)
  • Windows Vista (all editions)
  • Windows 7 (all editions)
  • Windows 8 (all editions)
  • Windows 8.1 (all editions)
  • Windows 10 (all editions)

 

 

 

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Sours: https://neosmart.net/wiki/fix-mbr/

Boot windows fix

Summary

When you use the Recovery Environment (Windows RE) to troubleshoot startup issues, first try the Startup Repair option in the System Recovery Options dialog box. If this does not resolve the issue, or if you have to manually troubleshoot additional issues, use the Bootrec.exe tool. This article talks about how to use the Bootrec.exe tool in the Windows RE to troubleshoot and repair the following items in Windows Vista or Windows 7:

  • A master boot record (MBR)

  • A boot sector

  • A Boot Configuration Data (BCD) store

You can also use the Bootrec.exe tool to troubleshoot a Windows Boot Configuration Data file is missing required information error.

How to run the Bootrec.exe tool

To run the Bootrec.exe tool, first start the Windows RE:

  1. Put the Windows Vista or Windows 7 media in the DVD drive, and then start the computer.

  2. Press a key when you are prompted.

  3. Select a language, a time, a currency, a keyboard, or an input method, and then click Next.

  4. Click Repair your computer.

  5. Select the operating system that you want to repair, and then click Next.

  6. In the System Recovery Options dialog box, click Command Prompt.

  7. Type Bootrec.exe, and then press Enter.

Information icon Note To start the computer from the Windows Vista or Windows 7 DVD, the computer must be configured to start from the DVD drive. For information about how to do this, see the documentation that was included with the computer, or contact the computer manufacturer.

The Bootrec.exe tool supports the following options. Use the option that's appropriate for your situation.

/FixMbr

This option writes a Windows 7 or Windows Vista-compatible MBR to the system partition. It does not overwrite the existing partition table. Use this option when you must resolve MBR corruption issues, or when you have to remove nonstandard code from the MBR.

/FixBoot

This option writes a new boot sector to the system partition by using a boot sector that's compatible with Windows Vista or Windows 7. Use this option if one of the following conditions is true:

  • The boot sector was replaced with a nonstandard Windows Vista or Windows 7 boot sector.

  • The boot sector is damaged.

  • An earlier Windows operating system was installed after Windows Vista or Windows 7 was installed. In this situation, the computer starts by using Windows NT Loader (NTLDR) instead of Windows Boot Manager (Bootmgr.exe).

/ScanOs

This option scans all disks for installations that are compatible with Windows Vista or Windows 7. It also displays the entries that are currently not in the BCD store. Use this option when there are Windows Vista or Windows 7 installations that the Boot Manager menu does not list.

/RebuildBcd

This option scans all disks for installations that are compatible with Windows Vista or Windows 7. Additionally, it lets you select the installations that you want to add to the BCD store. Use this option when you must completely rebuild the BCD store.

 Information icon Note Use the Bootrec.exe tool to troubleshoot a "Bootmgr Is Missing" error. If rebuilding the BCD store doesn't resolve the startup issue, you can export and delete the BCD store and then run this option again. By doing this, you make sure that the BCD store is completely rebuilt.

To do this, type the following commands at the Windows RE command prompt:

  • bcdedit /export C:\BCD_Backup

  • c:

  • cd boot

  • attrib bcd -s -h -r

  • ren c:\boot\bcd bcd.old

  • bootrec /RebuildBcd

Sours: https://support.microsoft.com/en-us/topic/use-bootrec-exe-in-the-windows-re-to-troubleshoot-startup-issues-902ebb04-daa3-4f90-579f-0fbf51f7dd5d
Bootrec Fixboot Access is Denied Windows 10 with Blue Screen Boot Loop

4 Ways to Fix Windows 10 Boot and Startup Errors

Does your PC need to be repaired?

Do you have problems booting your PC?

Do you want to fix & repair your Windows 10 startup issue?

In this ultimate tutorial, you will learn the best 4 methods to fix your PC boot errors and make Windows 10 boot again.

Firstly we will be using the Startup Repair tool, then we will use the Command Prompt to fix the MBR and BCD, then we will be fixing the boot through Command Prompt by restoring the regback, finally, we will use the Restore point.

Let’s dive in!

1. Fix Windows 10 Boot with Startup Repair

Restart your PC multiple times until you see a blue screen like this.

Click on “Troubleshoot“.

Click on “Advanced options“.

Click on “Startup Repair“.

Choose your account by clicking on it.

Enter your account’s password and click “Continue“.

Wait for a couple of seconds…

If this didn’t work keep reading… if it worked please leave a comment below!

2. Fix MBR & BCD to Repair Windows 10 Startup Error

Restart your PC and go to “Troubleshoot“.

Go to “Advanced options“.

This time click on “Command Prompt“.

Run these commands one at a time:

bootrec.exe /fixmbr bootrec.exe /fixboot bootrec.exe /rebuildbcd exit

Try to boot your PC now, if it didn’t work keep reading.

3. Fix Windows 10 Boot with Command Prompt (RegBack)

Restart your PC and click on “Troubleshoot“.

Click on “Advanced options“.

Click on “Command Prompt“.

Type these commands:

d: dir cd \windows\system32\config

Then run these commands:

md backup copy *.* backup cd regback copy *.* .. All exit

If anything went wrong all the files are saved under the backup folder we created, you can copy them back anytime.

Try to startup your computer, if it didn’t work then the only solution is to restore to a previous restore point.

4. System Restore to Repair Windows 10 Startup

Restart your PC and choose “Troubleshoot“.

Click on “Advanced options“.

Click on “System Restore“.

Click on your account to continue.

Type in your password.

Click “Next“.

Select your restore point, click “Next“.

Click “Finish” and confirm by clicking “Yes“.

Wait for a couple of seconds…

Click “Restart“.

There you have it!

You just learned how to fix the boot and startup problems on Windows 10 PC.

If you have any questions or just want to say thanks leave a comment below ;)


Sours: https://www.easytutorial.com/fix-windows-10-boot-startup-errors.html

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