Windows 8 and 8.1 Forums

W7 unbootable after installing 8.1, need urgent help

  1. #1

    Posts : 5
    Windows 7 32bit & Windows 8.1 64 bit

    W7 unbootable after installing 8.1, need urgent help

    My PC specs: Asus P8Z77-V with a SATA2 WD Caviar Black 500GB. The HDD has three partitions, and I've had Windows 7 32 bit installed on C:/ for three years.
    Before installation, the BIOS has Secure Boot and CSM enabled.
    Yesterday, I cut D: into two partitions, and use the second to install Windows 8.1 64-bit through a DVD. The installation went perfectly fine, and the new OS works wonder. The partitions now look like this (all primary, C is active):
    C:/Windows 7 <> D:/Stuffs <> E:/Windows 8 <> F:/Stuffs
    However, whenever I try to boot into Windows 7, I always receive an Windows Boot Manager error of "0xc000000f A required device isn't connected or can't be accessed".
    - First thing I done was popping in a W7 repair disc, however no problems were reported.
    - Then I disabled fast startup in W8, however it still uses the hiberfi.sys file.
    - I started msconfig in W8, and choose W7 as the default OS. Nothing changed.
    - Disabled Secure Boot and enable CSM to support both UEFI & Legacy in BIOS. Nothing changed.
    - Aligned partitions and rebuilt MBR in partition wizards. Nothing changed.
    I give up. I have tried every option possible. The only fix options I found left was winload.exe, bcdedit or using easybcd. I'm going to give it a shot but can't guarantee how will it turn out. Should anyone help me with this specific problem, I'd be greatly appreciated. Thanks for reading.

      My System SpecsSystem Spec

  2. #2

    Posts : 1,121
    Windows 8.1 x64

    My guess would be, and this is strictly a guess, the x64 install overwrote the 32 bit boot manager used for Windows 7.

    You have a Legacy install, and if you keep the 32 bit version of Windows 7, it will have to remain a Legacy install, so the CSM needs to be enabled.
      My System SpecsSystem Spec

  3. #3

    Posts : 5
    Windows 7 32bit & Windows 8.1 64 bit

    Ah, thanks for the reply, but I fixed it awhile ago. Turned out simply replacing winload~1.exe with winload.exe did help.
    The old winload.exe doesn't have a digital signature, which I think have been mentioned on this forum ago. Still thanks, I was panic at the thought of having reinstall Win 7 all over again
      My System SpecsSystem Spec

W7 unbootable after installing 8.1, need urgent help

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