How to properly dual boot 7 with Win10 (when 10 is installed first...)

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  1. Posts : 38
    Microsoft Windows 7 Ultimate 64-bit 7601 Multiprocessor Free Service Pack 1
       #1

    How to properly dual boot 7 with Win10 (when 10 is installed first...)


    Hey all, i know the recommended way is to install first the the previous versions of of the os then the newest, but what if 10 is installed first? how do i go doing that? please share you ways
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  2. Posts : 3,893
    win 8 32 bit
       #2

    How is 10 installed uefi, secure boot, gpt,mbr disk as that makes a difference
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  3. Posts : 38
    Microsoft Windows 7 Ultimate 64-bit 7601 Multiprocessor Free Service Pack 1
    Thread Starter
       #3

    samuria said:
    How is 10 installed uefi, secure boot, gpt,mbr disk as that makes a difference
    10 is installed in mbr, no uefi/gpt or secure boot - really classic (its P55 board by gigabyte)

    il rather install 7 on the same drive (256gb ssd), although i can also assign a new drive for it there is a need..
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  4. Posts : 16,454
    7 X64
       #4

    what if 10 is installed first?
    il rather install 7 on the same drive (256gb ssd)

    From within the win10 installation:

    1. Create a partition for win7.
    2. Apply the image.
    3. Add a bootmenu entry.

    Could also be done from winpe, but as there is already a win10 installed, might as well do it from there.

    I do it often, If you haven't done it before, it is quite simple.

    The appropriate image from win7 install.wim can be applied using dism commands or something with a gui, like gimagex or dism++ for example

    After applying the image add the boot menu entry:

    at administrator cmd prompt type

    bcdboot win7drivetter:\windows

    For example if the win7 image has been applied to partition E

    bcdboot E:\windows
    (then press enter)
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  5. Posts : 38
    Microsoft Windows 7 Ultimate 64-bit 7601 Multiprocessor Free Service Pack 1
    Thread Starter
       #5

    hey siw2 iv tried before your route quiet a few times of applying the wim then adding the boot entry - all is going fine until i trying to boot it (from boot menu selecting win7) then im getting 0xc errors

    maybe its because i tried to do it on vhd boot style?? created vhd partition - applying to it , adding to boot menu with easybcd - then restart to try booting to win7
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  6. Posts : 16,454
    7 X64
       #6

    dont need to use vhd. apply image to normal ntfs partition.

    Then use bcdboot command from within win10. It will automatically default to the current mode and the current bcd store, so no switches needed.

    just
    bcdboot e:\windows
    obviously replace e with whatever the win7 partition letter is in your case
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  7. Posts : 38
    Microsoft Windows 7 Ultimate 64-bit 7601 Multiprocessor Free Service Pack 1
    Thread Starter
       #7

    ok cool il try it. just for info - if i want it to be vhd its not possible?
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  8. Posts : 485
    Windows 7 Home Premium 64-bits
       #8

    I have two older computers from 2009 and 2013 that don't support UEFI. I have dual-boot of Windows 7 and 10 on both of them. I installed Windows 10 first and installed Windows 7 later on a separate drive. I used the EasyBCD app to configure the dual-boot.

    Computer #1 is dual-boot of Windows 10 Home and Windows 7 Pro

    After booting Windows 10 Home:

    How to properly dual boot 7 with Win10 (when 10 is installed first...)-1a1-disk-management.jpg
    How to properly dual boot 7 with Win10 (when 10 is installed first...)-1a2-easybcd.jpg

    After booting Windows 7 Pro:

    How to properly dual boot 7 with Win10 (when 10 is installed first...)-1b1-computer-management.jpg
    How to properly dual boot 7 with Win10 (when 10 is installed first...)-1b2-easybcd.jpg

    Computer #2 is dual-boot of Windows 10 Pro and Windows 7 Home

    After booting Windows 10 Pro

    How to properly dual boot 7 with Win10 (when 10 is installed first...)-2a1-disk-management.jpg
    How to properly dual boot 7 with Win10 (when 10 is installed first...)-2a2-easybcd.jpg

    After booting Windows 7 Home

    How to properly dual boot 7 with Win10 (when 10 is installed first...)-2b1-disk-management.jpg
    How to properly dual boot 7 with Win10 (when 10 is installed first...)-2b2-easybcd.jpg
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  9. Posts : 256
    Windows 7 Pro 64-bit
       #9

    If each on a separate drive, that would be much easier. IMO.
    (OP said on the same drive. SIW2's method is right. but I often failed. a headache for me)


    MisterEd said:
    I have two older computers from 2009 and 2013 that don't support UEFI. I have dual-boot of Windows 7 and 10 on both of them. I installed Windows 10 first and installed Windows 7 later on a separate drive. I used the EasyBCD app to configure the dual-boot.
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  10. Posts : 485
    Windows 7 Home Premium 64-bits
       #10

    siliconbeaver said:
    If each on a separate drive, that would be much easier. IMO.
    (OP said on the same drive. SIW2's method is right. but I often failed. a headache for me)
    I put them on separate drives because it makes it easier to deal with if I have to reinstall either Windows 7 or 10.

    Last week I realized that Computer #1 was not configured properly. In the BIOS SATA Mode was set to IDE instead of AHCI. When I changed SATA Mode to AHCI the computer would no longer boot to either Windows 7 or 10. I did manage to get Windows 10 to boot again but not Windows 7. I ended up reinstalling Windows 7. Having Windows 7 and 10 on different drives made this straight forward to do.
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