Windows 10 update corrupted dual boot options

  1. fireberd's Avatar
    Posts : 2,296
    Win 10 Pro, 20H2
       #1

    Windows 10 update corrupted dual boot options


    When I first installed the Win 10 Preview, it set up a dual boot (actually triple boot, 3 OS's - Win 7, Win 8.1 and Win 10). One of the Win 10 updates corrupted it. I've tried to fix it by booting with all 3 OS install discs and running "bootrec.exe".

    Bootrec.exe /rebuildbcd returns "Total identified windows installations 0"
    Bootrec.exe/scanos lists all 3 OS'

    Originally, I had a dual boot with Win 7/Win 8.1 until I installed the Win 10 Preview.

    I no longer get boot options. On a power on or restart it will either boot directly to Win 10 Preview or to Win 7. I have to enter the BIOS and select which OS I want.

    Jack
      My Computers

  2. Edwin's Avatar
    Posts : 17,059
    Windows 10
       #2

    I had the same thing once.
    Try holding Shift then press Restart, on the blue screen choose 'Change Defaults', the 'Timeout' entry might be 0
    Change it back to 30 seconds or whatever.
      My Computer

  3. fireberd's Avatar
    Posts : 2,296
    Win 10 Pro, 20H2
    Thread Starter
       #3

    "Shift then Restart" when or where?

    I can check the timeout setting in msconfig.
      My Computers

  4. Edwin's Avatar
    Posts : 17,059
    Windows 10
       #4

    Bring up Power Menu, hold Shift before pressing Restart.
    For some reason it doesn't matter what's listed in msconfig.
    (might not be the problem but it's worth a shot)
      My Computer

  5. fireberd's Avatar
    Posts : 2,296
    Win 10 Pro, 20H2
    Thread Starter
       #5

    Thanks for the timeout fix. It was set to 0 in the primary system's "msconfig" for the OS boot selection. Setting it back to 30 seconds fixed the problem.

    Jack
      My Computers

  6. Edwin's Avatar
    Posts : 17,059
    Windows 10
       #6

      My Computer

  7. ThrashZone's Avatar
    Posts : 7,107
    3-Win-7Prox64 2-Win10Prox64
       #7

    Yep get used to that one major updates 10 will always do that :/
      My Computers

  8. Winuser's Avatar
    Posts : 6,985
    Windows 10 Pro Insider
       #8

    I dual boot and so far it hasn't happened to me. :) Good info to have in case it ever does happen though.
      My Computers


 

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