Windows 10/Windows 7 Dual Boot.

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  1. Posts : 19
    Windows 10 Home
       #1

    Windows 10/Windows 7 Dual Boot.


    Okay.

    I got some games that refuse to run in windows 10. I have a legit copy of windows 7. So I am thinking about dual-booting windows 7, so I can play my old games again and only using the windows 7 OS to play old games that won't work on Windows 10.

    So I just want to make sure I have this right before I do it. I don't want to mess up a perfectly fine and working install of windows 10 for an OS I left behind months ago.

    In windows 10, partition off a unallocated section of the C; Drive that I have windows 10 installed on. Empty section of it naturally.

    insert the windows 7 disc, reboot.. boot from Disc

    install windows 7 to the newly partitioned unallocated section that I just made.

    Once windows 7 is done installing, reboot

    Now at this point, I assume a window will pop up before booting with the selection to either boot into windows 10 or windows 7?

    If any of that is wrong, please let me know.
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  2. Posts : 260
    Win 10 Pro X64
       #2

    I did the same thing but in reverse as had a Win 7 installed so partitioned the HD and installed Win 10 and yes after the 3rd reboot or so I had a screen allowing me to boot into either OS
    Last edited by shimshom; 20 Oct 2015 at 20:35.
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  3. Posts : 88
    Win 10 64 Bit
       #3

    You have to have the older OS installed first. At least with all the other MS OS's, it wouldn't work with the newer one installed cause of the MBR has to change and be the newer one. Please anyone, correct me if I'm wrong.
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  4. Posts : 2,764
    Windows 10 Pro X64
       #4

    Hi,

    No correction required. The older OS doesn't know about the new one so first you need to install the older one than the new one.
    After Win 10 or 8.0/8.1 for that matter has finished installing you should see a dual menu in the style of the last installed OS on the next reboot.

    Old style bios has the MBR BCD store modified, EFI style bios uses the existing EFI partition to add entries of new OS to.

    Should you use say a drive for each OS and both are enabled during set up of the last install and you tell Windows to install the new OS on the second HD then the first HD has to remain active or the second OS won't boot.
    If only one is enabled during install then you need to use the bios boot menu (usually invoked by pressing F12 at boot) to pick whatever system you want to boot into.
    Probably only useful if one of the installed systems is only temporary I guess.

    Cheers,
      My Computers

  5. NavyLCDR's Avatar
    Posts : 15,509
    Windows 10 Pro
       #5

    Madness10 said:
    You have to have the older OS installed first. At least with all the other MS OS's, it wouldn't work with the newer one installed cause of the MBR has to change and be the newer one. Please anyone, correct me if I'm wrong.
    fdegrove said:
    Hi,

    No correction required. The older OS doesn't know about the new one so first you need to install the older one than the new one.
    Now two corrections are required. Have you actually tried installing Windows 7 from Windows 10? Windows 7 will setup dual booting if installed from Windows 10 to a second partition. I've done it. However, to be fair, both systems I have done it on have older, legacy style booting bios.
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  6. Posts : 19
    Windows 10 Home
    Thread Starter
       #6

    So installing to a second partition on the same drive won't work then? I would need to install it to another hard drive, then use a boot menu from bios to boot into 7 when I want to play older games?
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  7. Posts : 107
    Windows 10
       #7

    You can install Windows 7 to the same hard drive or to another hard drive.

    After the installation you can choose an operating system to start (see screenshot below).



    When you are in Windows 10, open Command Prompt (Admin) and type: bcdboot %windir%

    If you want the Windows 8/10 style dual boot page (see screenshots below).



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  8. NavyLCDR's Avatar
    Posts : 15,509
    Windows 10 Pro
       #8

    Snake3169 said:
    So installing to a second partition on the same drive won't work then? I would need to install it to another hard drive, then use a boot menu from bios to boot into 7 when I want to play older games?
    genet's experience above was exactly the same as mine, on two different computers. Both of mine the Windows 7 was installed to a second partition on the same hard drive.
      My Computer


  9. Posts : 2,764
    Windows 10 Pro X64
       #9

    Hi,

    That works indeed but it's a bit more complex. Never tried that on a UEFI system but in theory it should work just the same.

    While Win10 may complain about its GPT partitions not being in the expected order, my experience is that it's not really an issue.

    Should anyone know about a decent GUI based bcd editor for UEFI system I'd like to know about it. :)

    Cheers,
      My Computers

  10. NavyLCDR's Avatar
    Posts : 15,509
    Windows 10 Pro
       #10

    fdegrove said:
    Should anyone know about a decent GUI based bcd editor for UEF system I'd like to know about it. :)

    Cheers,
    EasyBCD

    EasyBCD - NeoSmart Technologies

    There's a link to free version. You don't even have to "register". When you get to the registration page, just click download.
      My Computer


 
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