Windows 10: Cannot boot into Seven after installing Build 9926 Solved

  1.    24 Mar 2015 #1

    Cannot boot into Seven after installing Build 9926

    After installing Windows 10 build 9926 tonight in a dual boot set up with Seven, I can no longer access Seven at all. When I select to boot into Seven, all I get is a black screen.

    When I force a restart I get a pointless disk check that finds no new errors (a bad 4kb sector shows up, but that is old).

    I can sometimes get to the Windows Seven startup repair/restore screen, but running either of them does not seem to fix the problem.

    I can usually get into Ten (like I am now), but even then I have issues... like my mouse will not work about half of the time.

    I really need to get my Seven back... and no, a re-installation of Seven is not in the picture.

    How do I fix this mess?

    Edit: It looks like my boot sector has been moved from C:/ Seven to Y:/ Ten... and I don't know where that F:/ partition came from!
    Attached Thumbnails Attached Thumbnails Disk Mgmt.PNG  
      My ComputerSystem Spec

  2.    24 Mar 2015 #2

    The disk checks are due to the fast start option. Disable that and they will go away:

    Fast Startup - Turn On or Off in Windows 10 - Windows 10 Forums

    Setup Windows 7 as the default boot option and see if that resolves your black screen.
      My ComputerSystem Spec

  3.    24 Mar 2015 #3

    Thanks for the advice. Both suggestions worked great! Now I can figure out a good way to remove this Ten installation, fix the boot sector, and re-install it again.

      My ComputerSystem Spec

  4.    25 Mar 2015 #4

    In Win7, you should use the Backup feature to create and burn a Win7 Repair CD. You can then boot from that, run Startup Repair (you might have to run it three times), and that will restore the Win7-based boot loader files.
      My ComputerSystem Spec


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