Remove/Repair Dual-boot (Multi-boot) Configuration: Guide for Windows XP, Vista, 7, 8, 10

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If you have multiple versions of Windows installed on the same PC, your dual-boot (or multi-boot) configuration may cease to work.

The most common cause of a dual-boot or multi-boot configuration error (to stop working) is when reinstalling the older version of Windows before the newer version of Windows.

Windows XP and Windows 7, for example, were already configured as dual-boot and Windows XP was then reinstalled again. Windows Vista overwrites the MBR at the second launch, and Windows 7 does not accept the latest MBR.

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What is dual-boot/multi-boot

Dual-booting or multi-booting means installing multiple Windows versions (or other operating systems) on the same computer and being able to choose which operating system you’d like to boot into.

Dual boot Remove

It’s very common to see this kind of configuration on Windows computers:

Windows XP with Windows Vista
Windows Vista with Windows 7
Windows 8 with Windows 7
For more information on how to setup a dual-boot system, go to our guides from EasyBCD.

If you’re dual-booting Windows 8 with Windows 7, the boot options menu will look like this:

Dual boot Remove

How to Remove Dual Boot :

1. Select the operating system that you want to RUN.
2. Open RUN with the Keyboard shortcut Window + R.
3. Type “msconfig”.
4. Select “Boot”.
5. Select the operating system that you want to delete or remove.
6. Click on Delete and Press OK.
7. Restart your computer and Check.

Repair Windows 7 on a dual-boot system

In order to have Windows 7 back in your dual-boot options menu, use the bootsect utility to restore Windows 7’s MBR.

  1. Boot from the original Windows 7 installation DVD
  2. At the System Recovery Options screen, click Command Prompt
  3. Type:
    diskpart
  4. Press Enter
  5. Type:
    select disk 0

    Replace 0 with the disk available on the hard disk, where Windows 7 is installed on. To have the full list of disks from your computer, type list disk.

  6. Press Enter
  7. Type:
    list volume
  8. Press Enter
  9. Look for the drive’s letter of your optical drive (where the Windows 7 installation DVD is now running). This usually has “CD-ROM” mentioned in the Type column.
  10. Type:
    exit
  11. Press Enter
  12. Type:
    D:

    Where D: is the optical’s drive letter.

  13. Press Enter
  14. Type:
    cd boot
  15. Press Enter
  16. Type:
    dir
  17. Press Enter
  18. Type:
    bootsect /nt60 SYS /mbr
  19. Press Enter
  20. Type:
    exit
  21. Press Enter
  22. Restart your computer

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Repair Windows 8 or 8.1 on a dual-boot system

Using the bootrec utility you can repair Windows 8 or Windows 8.1 on a dual-boot system and boot into your Windows.

Using bcdboot, attempt to fix your computer and have the boot menu back:

  1. Insert the Windows 8 DVD or Windows 8.1 USB and restart your computer to boot from the media
  2. Go to Command Prompt (click Troubleshoot > Command Prompt)
  3. Type:
    bcdboot C:\windows

    Where C:\ is the drive’s letter where Windows 8 or Windows 8.1 is installed on.

  4. Press Enter
  5. Remove the DVD or USB
  6. Type:
    exit
  7. Press Enter
  8. Restart your computer

Fix #2: Use diskpart, then bootrec

  1. Insert the Windows 8 DVD or Windows 8.1 USB
  2. Restart your computer and boot from the media
  3. Click Repair your computer at the Welcome screenWindows 8 boot repair
  4. Go to Troubleshoot > Command Prompt
  5. Type:
    diskpart
  6. Press Enter
  7. Type:
    sel disk 0
  8. Press Enter
  9. Type:
    list vol
  10. Press Enter
  11. Determine which volume has FAT32 mentioned at the Fs column. This would be the UEFI/EFI partition with Windows 8/8.1
  12. Type:
    sel vol 2

    Where 2 is the volume with the FAT32 format.

  13. Press Enter
  14. Type:
    assign letter x:

    Where x: is the partition’s letter. The letter must be unique.

  15. Press Enter
  16. Type:
    exit
  17. Press Enter
  18. Type:
    cd /d x:\EFI\Microsoft\Boot\

    Where x: is the letter you used.

  19. Press Enter
  20. Type:
    bootrec /FixBoot
  21. Press Enter
  22. Type:
    ren BCD BCD.backup

    This would create backup of the BCD.

  23. Press Enter
  24. Type:
    bcdboot c:\Windows /l en-us /s x: /f ALL

    Where c:\ is the drive’s letter where Windows 8 is installed on.

  25. Press Enter
  26. Remove the DVD or USB
  27. Type:
    exit
  28. Press Enter
  29. Restart your computer

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Repair Windows 10 on a dual-boot system

Using the bootrec utility you can repair Windows 10 on a dual-boot system and boot into your Windows.

Using bcdboot, attempt to fix your computer and have the boot menu back:

  1. Insert the Windows 10 media and restart your computer to boot from the media
  2. Go to Command Prompt (click Troubleshoot > Command Prompt)
  3. Type:
    bcdboot C:\windows

    Where C:\ is the drive’s letter where Windows 10 is installed on.

  4. Press Enter
  5. Remove the DVD or USB
  6. Type:
    exit
  7. Press Enter
  8. Restart your computer

Fix #2: Use diskpart, then bootrec

  1. Insert the Windows 10 media
  2. Restart your computer and boot from the media
  3. Click Repair your computer at the Welcome screen
  4. Go to Troubleshoot > Command Prompt
  5. Type:
    diskpart
  6. Press Enter
  7. Type:
    sel disk 0
  8. Press Enter
  9. Type:
    list vol
  10. Press Enter
  11. Determine which volume has FAT32 mentioned at the Fs column. This would be the UEFI/EFI partition with Windows 10
  12. Type:
    sel vol 2

    Where 2 is the volume with the FAT32 format.

  13. Press Enter
  14. Type:
    assign letter x:

    Where x: is the partition’s letter. The letter must be unique.

  15. Press Enter
  16. Type:
    exit
  17. Press Enter
  18. Type:
    cd /d x:\EFI\Microsoft\Boot\

    Where x: is the letter you used.

  19. Press Enter
  20. Type:
    bootrec /FixBoot
  21. Press Enter
  22. Type:
    ren BCD BCD.backup

    This would create backup of the BCD.

  23. Press Enter
  24. Type:
    bcdboot c:\Windows /l en-us /s x: /f ALL

    Where c:\ is the drive’s letter where Windows 10 is installed on.

  25. Press Enter
  26. Remove the DVD or USB
  27. Type:
    exit
  28. Press Enter
  29. Restart your computer
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