Dual Boot Windows 10 with Windows 7 or Windows 8  

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  1. Posts : 18,432
    Windows 11 Pro
       #260

    You really have two choice, @ICIT2LOL. For both choices you want to use just the plain Windows 10 downloaded for free from Microsoft. You also need a partitioning program like MiniTool Partition Wizard. For both choices you need to shrink the Windows 7 partition to make free space. For choice 1, you just need enough free space for Windows 10 - 32 GB minimum but at least 50 GB would be better. For choice 2 you need enough free space to copy the existing Windows 7 to plus another 20 GB at least for the upgrade to Windows 10. Once you have the empty space on the hard drive created:

    Option 1:
    Create a partition in the free space and format it as NTFS.
    Boot the computer from a standard Windows 10 USB flash drive or DVD (NOT OEM).
    Select the custom install option (NOT upgrade).
    Select the newly created and empty NTFS partition and click next to install Windows 10 there.
    That will set up dual booting with the Windows 7 and it should read and use the Windows 8.1 product key in UEFI for automatic activation. You end up with a clean Windows 10 install that way.

    Option 2:
    Copy the existing Windows 7 partition (and the partition with the OS only and no other partitions) to the newly created free space.
    Set up dual booting with the bcdboot command.
    Boot into the second Windows 7.
    Run setup.exe from the Windows 10 ISO file, USB flash drive or DVD to upgrade it to Windows 10. You end up with a Windows 10 installed that contains all the programs and data that were installed in Windows 7. This actually uses the Windows 7 product key for activation, but that doesn't really matter because you have the second license for Windows anyway in the form of the Windows 8.1 product key stored in UEFI.

    Either option, your Windows 10 will be activated with a digital license and will get the generic Windows 10 Pro product key ending in -3V66T

    To use bcdboot:
    If you copy the Windows 7 partition, the second Windows 7 partition will get a drive letter. Let's say it gets F:. You will open a Command Prompt (Admin) and run the following command in the window:

    bcdboot F:\Windows /addlast /d

    Change F:\ to whatever drive letter the new Windows 7 gets.
      My Computer


  2. Posts : 11,062
    Windows 10 Pro version 22H2 0n one desktop and running Window 11 Pro 22H2 on unsupported desktop
       #261

    Ok Navy mate I think I will try the first option as the second one seems to need more separate things to be done and to be honest I have in the past only dual booted Linux systems and it seemed so simple back then .

    I am as you will have guessed a while ago no expert and I think when you said copy the 7 to the other partition it threw me a bit as I couldn't figure out how to do that in PW or through the Disk Manager.

    Now if I go with option one I am assuming it will install the latest build - well in any case I can always clean this drive again and clone it form the spare 7 drive - I usually do this to prevent me from losing everything.

    Wish me luck.

    Edit: Look am still having problems uploading attachments I hope this will come through.

    Dual Boot Windows 10 with Windows 7 or Windows 8-navy.png
    Last edited by Brink; 05 Apr 2017 at 22:19. Reason: attached uploaded image via paperclip icon
      My Computer


  3. Posts : 11,062
    Windows 10 Pro version 22H2 0n one desktop and running Window 11 Pro 22H2 on unsupported desktop
       #262

    Ok Navy and Shawn have got it done but I have to say it was nightmare when it first installed. It refused my Microsoft account password wanted to contact me through gmail an account I wished I has never set up and the code they send you.

    It is very frustrating and if it were not for my other machines to use I would be sitting here like some dummy (a tad true I suppose) so in exasperation I shut the machine down and rebooted only to find it went through the same set up only this time it let me type in what I wanted to - but I suppose I have it installed on that other partition now.

    All I have now is to set up my email server though my secondary back up email account is now being blocked by Outlook.live.com - thank heavens for Thunderbird or I would be sunk.

    Anyway enough of my grizzling and thanks for the time, trouble and patience you both have put in because the actual process turned out to be as simple as loading that installation stick - whereas I saw it as going round the houses
      My Computer


  4. Posts : 68,937
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #263

    I'm happy to hear that you got it installed and running John. I hope the reset goes smoothly for you.
      My Computers


  5. Posts : 11,062
    Windows 10 Pro version 22H2 0n one desktop and running Window 11 Pro 22H2 on unsupported desktop
       #264

    Thanks Shawn yes mate this is coming from the 10 boot as I type

    I must say I did read too much into the instructions and probably my Achilles heel too much rush not enough haste as the broken leg testifies too.

    Anyway up and walking around now without too much use of the stick and getting less painful by the day.
      My Computer


  6. Posts : 11,062
    Windows 10 Pro version 22H2 0n one desktop and running Window 11 Pro 22H2 on unsupported desktop
       #265

    Ok I got permission last night to use an OEM copy key to dual boot this machine after U had explained I had installed the OEM on the wrong machine.

    Now I have set the partition up as stated (half the drive) and carry on until I get to setup.exe but there is no setup.exe in the listing only setup and clicking that gives me an error message see pic

    Now I am only guessing here but is this stick the techie made for me supposed to be clean installed onto and empty drive?? as I know she checked the key and my machine for something.

    and perhaps I can add the 7 later for the dual boot??

    Edit Soory the pic will not attach but says something along the lines of a side by side configuration??

    Dual Boot Windows 10 with Windows 7 or Windows 8-setup.png
    Last edited by Brink; 03 May 2017 at 21:22. Reason: attached your uploaded image
      My Computer


  7. Posts : 68,937
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #266

    Hey John, :)

    If you like, you could see if you may be able to boot from the USB to start Windows Setup, and select to install to the partition you have set up.
      My Computers


  8. Posts : 11,062
    Windows 10 Pro version 22H2 0n one desktop and running Window 11 Pro 22H2 on unsupported desktop
       #267

    Ok mate I will set the BIOS to that - just what about the secure boot should I disable that first please??
      My Computer


  9. Posts : 68,937
    64-bit Windows 11 Pro for Workstations
    Thread Starter
       #268

    Yes, you would also want to disable secure boot until you have finished installing Windows 10.

    Unless supported by the motherboard, you usually won't be able to boot from the USB with secure boot enabled.
      My Computers


  10. Posts : 11,062
    Windows 10 Pro version 22H2 0n one desktop and running Window 11 Pro 22H2 on unsupported desktop
       #269

    Ok mate will do and I have disabled the AV too like Christina said to last night when she was working things around and funny thing was she whipped out CCleaner and MBAM too LOL!!
      My Computer


 

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