Windows 8 and 8.1 Forums


Problems with Win 8.1/7 dual boot

  1. #1


    Posts : 4
    win 8 pro 64x

    Problems with Win 8.1/7 dual boot


    I have a new system with a HD from an older system with win 7 32x. I reformatted another (1T) HD and installed win 8.1 64x. Win 8.1 did not add win 7 to its bootloader, so I added it manually using bcdedit. Win 7 shows up when win 8.1 starts, but won't boot and goes into repair mode (that also didn't help). Below is the current bootloader. I changed the path for win 7 from winload.efi to winload.exe since there was no winload.efi in the system32 folder, but it didn't help. If I unplug the Win 8.1 HD Win 7 boots fine. My BIOS is set to boot both EFI and legacy. Seems the problem has to do with the older win 7 MBR and win 8.1 EFI? Thanks for your help!

    Windows Boot Manager
    --------------------
    identifier {9dea862c-5cdd-4e70-acc1-f32b344d4795}
    device partition=\Device\HarddiskVolume2
    path \EFI\Microsoft\Boot\bootmgfw.efi
    description Windows Boot Manager
    locale en-US
    inherit {7ea2e1ac-2e61-4728-aaa3-896d9d0a9f0e}
    integrityservices Enable
    default {59011db2-dee5-11e3-82c8-d7d6499771ab}
    resumeobject {59011db1-dee5-11e3-82c8-d7d6499771ab}
    displayorder {59011db2-dee5-11e3-82c8-d7d6499771ab}
    {59011db5-dee5-11e3-82c8-d7d6499771ab}
    toolsdisplayorder {b2721d73-1db4-4c62-bf78-c548a880142d}
    timeout 30


    Windows Boot Loader
    -------------------
    identifier {59011db2-dee5-11e3-82c8-d7d6499771ab}
    device partition=C:
    path \Windows\system32\winload.efi
    description Windows 8.1
    locale en-US
    inherit {6efb52bf-1766-41db-a6b3-0ee5eff72bd7}
    recoverysequence {59011db3-dee5-11e3-82c8-d7d6499771ab}
    integrityservices Enable
    recoveryenabled Yes
    isolatedcontext Yes
    allowedinmemorysettings 0x15000075
    osdevice partition=C:
    systemroot \Windows
    resumeobject {59011db1-dee5-11e3-82c8-d7d6499771ab}
    nx OptIn
    bootmenupolicy Standard
    useplatformclock Yes


    Windows Boot Loader
    -------------------
    identifier {59011db5-dee5-11e3-82c8-d7d6499771ab}
    device partition=D:
    path \Windows\system32\winload.exe
    description Windows 7
    locale en-US
    inherit {6efb52bf-1766-41db-a6b3-0ee5eff72bd7}
    recoverysequence {59011db3-dee5-11e3-82c8-d7d6499771ab}
    integrityservices Enable
    recoveryenabled No
    isolatedcontext Yes
    allowedinmemorysettings 0x15000075
    osdevice partition=D:
    systemroot \Windows
    resumeobject {59011db1-dee5-11e3-82c8-d7d6499771ab}
    nx OptIn
    bootmenupolicy Standard

      My System SpecsSystem Spec

  2. #2


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    With Windows 8 is currently booted. Open the elevated command prompt and type as shown below where G: is the drive containing Windows using legacy BIOS. the drive letter could be different from your PC.

    Click image for larger version

    Run Msconfig will show you the dual boot configuration:

    Click image for larger version

    And below are the screens show they can be booted with one is EFI and the other is MBR. Just note that they swap the Drive Letter.
    C for G.
    Click image for larger version

    Click image for larger version

    So all you need is a single command: bcdboot G:\Windows for dual boot.
    And of course, the BIOS need to be set for both BIOS+UEFI.

    SO if the Windows 7 fails to boot then the problem is something else.
    EDIT: Just notice that you said you can boot Windows 7 separately.
    Last edited by topgundcp; 21 May 2014 at 01:22.
      My System SpecsSystem Spec

  3. #3


    Posts : 4
    win 8 pro 64x


    When I tried bcdboot d:\Windows it said "Failure when attempting to copy boot files." (D: is where win 7 resides.)
      My System SpecsSystem Spec

  4. #4


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    With what I've shown above was dual boot with 2 Windows running 64 bit. Your Windows 7 is running 32 bit version so I am not sure it will work with UEFI.
    Last edited by topgundcp; 21 May 2014 at 23:50.
      My System SpecsSystem Spec

  5. #5


    Posts : 4
    win 8 pro 64x


    I found a work-around, but it doesn't solve the issue. If I enter the BIOS (UEFI) and change to legacy only the system will start Win7. To boot back into Win 8.1 I have to enter UEFI again, change to UEFI and legacy. Also, chkdisk wants to run when I boot into Win 7. *sigh*
      My System SpecsSystem Spec

  6. #6


    San Jose - California
    Posts : 2,847
    8.1x64PWMC Ubuntu14.04x64 MintMate17x64


    Your best bet is not to dual boot. With new MB, just set your BIOS for both Legacy+UEFI, the default OS to boot is the first disk in the boot priority and when you want to boot the other OS, just use the quick menu to access the boot screen and select it. different MB manufacturer use different function key to display the boot menu. For example, My MB is from MSI, so F11 is the function key to display the boot menu, yours might F12 or whatever, you need to find out from the manual.

    Your HD error is another problem, just let chkdsk run to fix it, it might take a while for it to complete so be patient.
      My System SpecsSystem Spec

  7. #7


    Posts : 1,121
    Windows 8.1 x64


    If you continue to get the chkdsk, you might try turning off the Windows 8 Fast Startup option and test in that configuration for a while.
      My System SpecsSystem Spec

  8. #8


    Posts : 4
    win 8 pro 64x


    Quote Originally Posted by Saltgrass View Post
    If you continue to get the chkdsk, you might try turning off the Windows 8 Fast Startup option and test in that configuration for a while.
    Yeah, found out about fast boot here: https://neosmart.net/forums/showthread.php?t=12890
      My System SpecsSystem Spec

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