Windows 8 and 8.1 Forums


dual boot windows vista on a pre-installed windows 8.1

  1. #51


    Posts : 83
    Windows 8.1 with windows 7


    wait I have another Q: aero will be applied?

    Click image for larger version

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  2. #52


    Posts : 2,690
    Windows 3.1 > Windows 10


    you will have to install your system drivers after you install the windows 7 OS
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  3. #53


    Posts : 83
    Windows 8.1 with windows 7


    okay
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  4. #54


    Posts : 83
    Windows 8.1 with windows 7


    Q: do I need to select "Find and add windows version already installed on this PC"
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  5. #55


    Posts : 2,690
    Windows 3.1 > Windows 10


    if using WinNTsetup - yes

    if running setup.exe from within windows 8.1 - no
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  6. #56


    Posts : 83
    Windows 8.1 with windows 7


    Thank you again
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  7. #57


    Posts : 83
    Windows 8.1 with windows 7


    hi again I have now dual boot but windows 7 wont boot up it got stuck on "starting windows"

    but windows 8.1 boots up normally
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  8. #58


    Posts : 83
    Windows 8.1 with windows 7


    also when I selected windows 7 at DOS windows boot manager it says "updating registery" when it restarted I choosed windows 7 and it got stuck
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  9. #59


    Posts : 120
    Windows 10 Pro x64


    ^^Guess what. I'm having the exact same issue at the moment. Unknown as to why seeing as at one point I had w7 installed. Trying to troubleshoot it at the moment. I think it may be that regardless if you use winntsetup or not you have to have CSM on *for the install* until you get your chipset and such drivers installed. Then you can reenable full UEFI. I'm going to try it and let you know.
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  10. #60


    Posts : 120
    Windows 10 Pro x64


    OK
    Its exactly as I suspected: For some reason, windows installer, regardless if you install via WinNTSetup or setup.exe or boot from USB/DVD, requires the legacy option ROM or UEFI w/ CSM be enabled for the install process. Once the install process finished and I booted to OOBE, I entered audit mode (Ctrl+Shift+F3) , installed all my drivers and did the customisations for my laptop's high resolution 4k display, then rebooted back into OOBE, (cmd -> run as admin -> cd sysprep -> sysprep /oobe /reboot) and just before it booted again for OOBE, I went back into my UEFI and disabled legacy option ROM, and the laptop booted both Win7 and Win8.1 fine.

    Tested on all three WinNTSetup, run setup.exe from Win8.1, and boot direct from USB. All had to have legacy optionrom/UEFI w/CSM enabled for the install process only, it can be turned off after you go into audit mode and install your drivers, and set it back to OOBE boot.

    Hope this helps.

    If you need me to make a video, I can, but I don't really want to, so try doing it like this first :P
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dual boot windows vista on a pre-installed windows 8.1
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