1.    14 Dec 2014 #1
    Join Date : Jan 2014
    Inverness
    Posts : 1,197
    Win 10

    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 ComputersSystem Spec
  2.    14 Dec 2014 #2
    Join Date : Feb 2014
    Posts : 9,462
    Windows 10 Professional

    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 ComputersSystem Spec
  3.    14 Dec 2014 #3
    Join Date : Jan 2014
    Inverness
    Posts : 1,197
    Win 10
    Thread Starter

    "Shift then Restart" when or where?

    I can check the timeout setting in msconfig.
      My ComputersSystem Spec
  4.    14 Dec 2014 #4
    Join Date : Feb 2014
    Posts : 9,462
    Windows 10 Professional

    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 ComputersSystem Spec
  5.    14 Dec 2014 #5
    Join Date : Jan 2014
    Inverness
    Posts : 1,197
    Win 10
    Thread Starter

    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 ComputersSystem Spec
  6.    14 Dec 2014 #6
    Join Date : Feb 2014
    Posts : 9,462
    Windows 10 Professional

      My ComputersSystem Spec
  7.    14 Dec 2014 #7
    Join Date : Nov 2013
    Houston
    Posts : 2,352
    3-Win-7Prox64 2-Win10Prox64

    Yep get used to that one major updates 10 will always do that :/
      My ComputersSystem Spec
  8.    14 Dec 2014 #8
    Join Date : Jun 2014
    Posts : 5,544
    Windows 10 Pro

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

 


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