Dual Boot Windows 10 with Windows 7 or Windows 8  

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  1. Posts : 56,676
    Multi-boot Windows 10/11 - RTM, RP, Beta, and Insider

    Brink said:
    I guess so. My dual boot setups with W7/W10 and W8.1.1/W10 still show C: for whatever I started up in. I suppose as long as both OSs are running fine, I wouldn't worry to much about it.

    A few questions to see if anyone else with the same may also see this.

    What other OS are you dual booting with?

    Did you install W10 on a separate hard drive or on another partition with the other OS?

    Are you using UEFI?
    I'm dual booting with 7 on same drive separate partition. Even though it's on the slower half of the drive, I've had no problems. Shrunk the original 500gb in half and used the un-allocated space for 10. One note on dual boot... Win 7 (or any other earlier version of Windows) will "eat" the restore points on Win 10 OS. To avoid this make the following reg changes:

    Windows 7 side:

    HKLM\SYSTEM\MountedDevices\Offline \DosDevices\W: REG_DWORD 0x00000001 (1)

    Windows 10 side:

    HKLM\SYSTEM\MountedDevices\Offline \DosDevices\E: REG_DWORD 0x00000001 (1)

    The drive letters may vary, but this is my setup.

    Only the Win 7 side is really necessary, but I wanted to avoid ANY co-mingling!

    I also use a folder on an external USB drive to pass files, progs, etc. back and forth. Gave it a cute name Win7_Win10_Tunnel.

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  2. Posts : 56,676
    Multi-boot Windows 10/11 - RTM, RP, Beta, and Insider

    marcel1600 said:
    I want to remove the dual boot, I have an Windows 10 install and an Windows 8 install on VHD. I want to remove the Windows 8 boot. Has anyone experience with removing dual boot? I read some time it is tricky.

    Check out this link. If I read your question correctly, this may be what you want to do.


    Last edited by derekimo; 30 Oct 2014 at 11:46. Reason: Updated link of tutorial
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  3. Posts : 281

    It helps when discussing these to post a screenshot of Disk Management - How to Post a Screenshot of because experience has shown that in more than half of cases there are complications involved revealed by seeing all of the partitions' labels.
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  4. Posts : 29,078
    Windows 10 21H1 Build 19043.1023

    Tews said:
    Hey Greg, Good to see you. We will need your expertiese to keep all of the newbs in line!!
    Newbs, heck! We need him to keep us "wannabe gurus" in line!
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  5. Posts : 1,909
    Windows 11 Home 64-bit

    Is there a way to delete the dual boot configuration once the Tech Preview expires?
      My Computers

  6. Posts : 66,512
    64-bit Windows 11 Pro for Workstations
    Thread Starter

    Hello Jesse,

    Sure, you can pretty much do the same below by just deleting the Windows 10 installation, and removing it's entry in msconfig. :)

    Dual Boot Windows 7 and Windows 8 - Delete Windows 8
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  7. Posts : 963
    dual boot W10 10586th2/14291 rs1 Win. Insider since Jan. 2015

    W10 (9926) x64 is Dual boot on a win 7 x64 partition here installed with ISO DVD install was smooth runs reasonably well (pretty fast also ) only mis behaves occasionally but can be persistent when it does. I am using for daily driver now with Chrome x64 as default browser.

    Seems to me IE11 (specific to this build) is very fast but unstable now and then and page reliability could be better ...no matter I always use Chrome as default anyway . F/F runs decent on W10 also . ..... I think they fixed the restore point thing since OCT build .
      My Computer

  8. Posts : 155
    Windows 8.1 Pro/Windows Preview 10

    Did that along with Windows 8.1 on the flat screen,nice

    with Windows 8.1 and updates. Not working. Also I keep getting this.
    Unable to boot Win 8.1: Error bad_system_config_info

    I will deal with it:)

    So we couldn't complete the updates. So were undoing changes don't turn off your computer. But I WILL lol.
    lalala boy it's taking it's good ol' time.
    Last edited by Gina France; 11 Feb 2015 at 22:38.
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  9. Posts : 2
    Windows 7/8.1

    Hello all!

    Thanks for the great tutorial! I have a follow-up question for the gurus here (I promise I tried to piece it together from comments first but either missed it or it wasn't stated). I'm trying to dual boot on a Win 8.1 laptop (with UEFI) that has only 1 drive. i've partitioned the C drive (carved off 100GB) and made bios changes (enable legacy support, disable safe boot). Attempting to install from USB I get the error about not being able to install because the disk is GPT. My biggest concern is when going through the tutorial at step 10, it tells you to delete all partitions until you only have the install partition left. I'm pretty sure I know this but want to confirm, if I do that, will it not delete my Win8.1 install? I'd really like to keep my existing install so any advice is appreciated. (this really makes me long for the days of MBR and just manually updating a couple of things to add it to the boot list!).

    Thanks in advance!
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  10. Posts : 66,512
    64-bit Windows 11 Pro for Workstations
    Thread Starter

    Hello Kevin, and welcome to Ten Forums. :)

    You DO NOT want to delete all partitions on the drive since it contains Windows 8.1 that you want to keep. You would only delete all partitions if you were doing a clean install and didn't want anything on the drive.

    Since Windows 8.1 is installed with UEFI, you need to leave it enabled in your UEFI firmware settings.

    With your setup, it would be easier to do step 5 to install Windows 10 to your 100 GB partition from within Windows 8.1.
      My Computers


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