Install windows 7 after windows 10 on 1 harddrive (problem)


  1. pveeningen
    Posts : 9
    Windows 7, 10, and 11
       New #1

    Install windows 7 after windows 10 on 1 harddrive (problem)


    Hello everyone!

    I have searched everywhere, but i can not get a clear answer..
    My Dell laptop, which i use for my work had all the time already a dual boot system.
    But when i created it, i installed Windows 7 first, and after 7, i installed Windows 10.
    Everything worked just perfect!!

    Now my windows 7 would not boot anymore, no idea what happend, so i backed up my files from the drive, removed partition, created new one, and re-installed windows 7.
    With Windows 10 still on my laptop!!

    But now comes the problem i am facing.. When i boot to Windows 10, my C drive is the windows 10 partition, and the D drive is the windows 7 partition ( LIKE IT SHOULD BE ) :)

    But when i am booting in Windows 7, my C drive is still the Windows 10 partition, and my D drive the Windows 7...
    So when i want to install software, everything gets stored at the wrong partition..

    Before when i booted into windows 7, then my C drive was the partition with my Windows 7 installation, and the D drive the partition with the Windows 10 installation.. ( So they need to be switched! )

    I tried already a lot of things. Like changing drive letters, what windows won't let me do. Also not in CMD.
    I already tried several commands in CMD, but maybe not the right one...

    Has anyone ever solved this situation, because i really need also a seperate Windows 7 installation on my laptop for older software, and i really don't like Virtual machines...

    I hope someone can help me out please! :)
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  3. idgat
    Posts : 2,494
    Windows 11 Pro (latest update ... forever anal)
       New #2

    I've often found that when dual boots go pear-shaped, it is frequently not worth the time, effort or frustration trying repair the problem. Starting over again can be a proper PITA but often results in less time, effort and greater satisfaction.

    Then, from a salient lesson lesson learnt, regular frequent imaging.
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  4. NavyLCDR
    Posts : 18,500
    Windows 11 Pro
       New #3

    Sounds like you installed Windows 7 from inside Windows 10. You need to install Windows 7 by booting from the install media.
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  6. pveeningen
    Posts : 9
    Windows 7, 10, and 11
    Thread Starter
       New #4

    That is a good one! I installed windows 7, 2 times, but the second time indeed from windows 10 itself.

    I am now trying immediately from booting by USB and install windows 7 again!!

    Thanks for the comment! I will post the result!
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  7. Megahertz
    Posts : 7,278
    Windows 11 Pro - Windows 7 HP - Lubuntu
       New #5

    NavyLCDR said:
    Sounds like you installed Windows 7 from inside Windows 10. You need to install Windows 7 by booting from the install media.


    Windows can be installed in two ways: Legacy-MBR or UEFI-GPT
    If your Win 10 is an UEFI-GPT you must install Win 7 as UEFI-GPT
    If your Win 10 is an Legacy-MBR you must install Win 7 as Legacy-MBR.

    To install as Legacy-MBR you must boot the installation drive as Legacy
    To install as UEFI-GPT you must boot the installation drive as UEFI.
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  8. pveeningen
    Posts : 9
    Windows 7, 10, and 11
    Thread Starter
       New #6

    Yes it worked!!

    This time there has been added a seperate partition with the Windows 7 setup, and all is good now!

    Special thanks to you all!!
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  9. SIW2
    Posts : 5,079
    several
       New #7

    Instead of reinstalling for a third time, you could have generalized win 7 then set the osletter to C .

    I seem to recall I tested that scenario.

    I have made little thing to set the osletter because it useful in several situations.

    edit: changed the wording to make it clearer

    Install windows 7 after windows 10 on 1 harddrive (problem)-bcdbootdisk-set-osletter.jpg
    Last edited by SIW2; 18 Jul 2023 at 17:11.
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  10. Megahertz
    Posts : 7,278
    Windows 11 Pro - Windows 7 HP - Lubuntu
       New #8

    Please mark this thread as Solved
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