Win10+Win7 dual boot issue

  1. Posts : 15
    Win 10

    Win10+Win7 dual boot issue

    Dear all,

    I hope I have not missed a thread with a similar problem:
    I had Win10 installed on drive C: with the boot loader on drive D: (where I previously had my old Win10 installation). I wanted to add Win7 to my PC and formated drive D: - I totally forgot that I had the boot loader on that disk... Now I have Win7 on drive D: and drive C: is unchanged but I can not boot into Win10. I tried all the bootrec /fixmbr stuff, but found that my drive C: is not a MBR but a GPT...
    Is there a way to access my Win10 installation without reinstalling the whole thing?

    Thanks in advance!
      My Computer

  2. Posts : 18,455
    Windows 11 Pro

    What drive letter is your Windows 10 partition getting in Windows 7? Let's say it is D:\. Open an elevated ("run as administrator") command prompt in Windows 7. In the elevated command prompt Window run:

    BCDBOOT D:\Windows /d /addlast

    The path in red will be to the Windows folder on the Windows 10 drive letter.

    Then reboot the computer.
      My Computer

  3. Posts : 15
    Win 10
    Thread Starter

    The BCDBOOT D:\Windows /d /addlast command did not work in win7, but BCDBOOT D:\Windows did the trick - now the boot manager of Win10 is active and i can choose both OS! Thanks a lot!
      My Computer


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