Is it somehow possible to install Windows 7 on UEFI (non CSM) laptop ?

Discussion in 'Windows 7' started by acid1996, Jan 15, 2016.

  1. acid1996

    acid1996 MDL Novice

    Jul 29, 2015
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    Hello MDL,

    As the topic says, I have an issue of trying to install Windows 7 on UEFI mode(made GPT UEFI stick with Rufus) and when I boot to the stick while Secure boot disabled I get stuck under Starting Windows splash screen just before first screen of the Windows 7 setup procedure.

    I already tried time ago, to install on legacy mode and succeeded but I don't want to migrate again from GPT to MBR or vice versa since in the future I'll be probably back to Windows 10 when it gets polished up.
    If you have some kind of solution, I'd be very grateful :worthy:

    EDIT : Laptop is Acer E5-573G with Insyde BIOS.
     
  2. windsman

    windsman MDL Expert

    Jan 11, 2010
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  3. ashish.k

    ashish.k MDL Member

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  4. acid1996

    acid1996 MDL Novice

    Jul 29, 2015
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    #4 acid1996, Jan 16, 2016
    Last edited: Jan 16, 2016
    (OP)
    Thanks for the posts guys, I'll try the method from ashish.k since I have built in DVD reader/writer in my laptop. Oh and my current OS is Windows 10 64bit, and I already have that BIOS installed ;)


    EDIT : Since I don't have Win Disc at the moment I decided to try with ISO and when I try to execute bootsect command, I get this :

    This tool can only be run on systems booted using a PC/AT BIOS. This system
    was booted using EFI or some other firmware type.

    Do I need to try with real Windows disc ?
     
  5. ashish.k

    ashish.k MDL Member

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    You don't need a DVD drive for my method. An ISO for Windows and mounting it would do fine.
     
  6. acid1996

    acid1996 MDL Novice

    Jul 29, 2015
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    But I'm still getting this error when I try to execute BOOTSECT.exe command :

    This tool can only be run on systems booted using a PC/AT BIOS. This system
    was booted using EFI or some other firmware type.

    I'm using Windows 7 SP1 x64 Enterprise ISO and I'm currently on UEFI x64 Windows 10.
     
  7. ashish.k

    ashish.k MDL Member

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    #7 ashish.k, Jan 16, 2016
    Last edited: Jan 16, 2016
    That is the reason. You are on UEFI x64 Win10. Find a PC which runs on Legacy BIOS to do the Bootsect.exe command.
    Bootsect.exe command is rather not important for you at least because this command makes the USB bootable for non-UEFI (Legacy BIOS PCs). Since you have to install Win7 on UEFI PC you can skip Bootsect.exe command but USB will be bootable only on UEFI PCs this way.

    Edited my Tutorial regarding this drawback. I totally forgot to put this reminder. Thanks!

    Regards.
     
  8. acid1996

    acid1996 MDL Novice

    Jul 29, 2015
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    Thanks for your reply, now I proceeded without the executing the command, restarted my laptop, disabled Secure boot again and booted to USB but unfortunately it got freezed again around the beginning of "Starting Windows" splashscreen.

    Looks like my laptop OEM(Acer) strongly forces the use of >=Windows 8 with UEFI.

    BTW: Can I somehow get a log from the point of USB boot till the freezing point ?
     
  9. sebus

    sebus MDL Guru

    Jul 23, 2008
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  10. ashish.k

    ashish.k MDL Member

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    Okay, this will definitely work as it is the only solution left...

    Make bootable USB of Win8.1/10 using rufus (select MBR partition scheme for UEFI and FAT32 filesystem) and delete install.wim in "/sources/".

    The right procedure to install Win7 on latest UEFI-only PCs would be to have the file "install.wim" of Win7 setup copied to the installation files of Win8.1/10. I mean just delete "install.wim" of Win8.1/10 in "/sources/" and copy "install.wim" file of Win7 here.

    In conclusion, setup files of Win10 and "install.wim" of Win7. So the setup will resemble Win8.1/10 but it will actually install Win7.

    I hope this helps.
     
  11. MrMagic

    MrMagic MDL Guru

    Feb 13, 2012
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    Win 7 install.wim is compatible with the rest of the Win 8.1/10 ISO ?

    (I never tried, just wondering)
     
  12. Mr.X

    Mr.X MDL Guru

    Jul 14, 2013
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    Yes it is. I know for sure on Win8.1 setup files, dunno on Win10.
     
  13. sebus

    sebus MDL Guru

    Jul 23, 2008
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    Another trick learned...

    Thanks

    sebus
     
  14. MrMagic

    MrMagic MDL Guru

    Feb 13, 2012
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    Good to know, thanks
     
  15. acid1996

    acid1996 MDL Novice

    Jul 29, 2015
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    #15 acid1996, Jan 16, 2016
    Last edited: Jan 16, 2016
    (OP)
    Great, I'll try this now.
    But now I'm wondering, what IF I make MBR for UEFI with Windows 7 ISO with Rufus, could that work ? Just wondering :confused:
    EDIT : Didn't work, left with the Win 10 setup trick.

    On other hand, I'll surely try the method with using Windows 10 setup files with Windows 7 install.wim. :biggrin:
     
  16. acid1996

    acid1996 MDL Novice

    Jul 29, 2015
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    It does not work, after copying files, setup commences restart, and when Wibdows 7 screen shows up and gets stuck again. Luckily I found that disk.sys causes that (through safe mode boot.)

    I give up, I'll continue use of Windows 10.
     
  17. ashish.k

    ashish.k MDL Member

    Dec 27, 2014
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    #17 ashish.k, Jan 17, 2016
    Last edited: Jan 17, 2016
    I guess then Win7 needs UEFI+CSM to boot properly. It wasn't made for UEFI PCs actually as to make the ISO support for UEFI we have to do the bootx64.efi file trick (otherwise it won't boot on UEFI+CSM too).

    So I think Win7 is too old for your UEFI only PC. Nevertheless, I tried my best but you have to use Win8.0+ on your PC.

    Anyways, I'll try to boot Win7 again on my UEFI-only PC and report. Last time I just booted it when UEFI+CSM was enabled. Now I'll disable CSM completely and try to boot in UEFI only.


    EDIT: Confirmed! Win7 does not boot on UEFI-only (without CSM). Win8.0+ required for UEFI-only PCs. Only UEFI+CSM and Legacy BIOS works for Win7.
     
  18. Mr.X

    Mr.X MDL Guru

    Jul 14, 2013
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    Interesting, could you please point where the bootx64.efi file trick is? Please.
     
  19. ashish.k

    ashish.k MDL Member

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    Post----> Here
     
  20. LatinMcG

    LatinMcG Bios Borker

    Feb 27, 2011
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    if you have win 8 or 10 in efi booting.. add boot entry with easybcd for win 7. so it boots from win 8 or 10 and loads 7.
    however disk.sys points to AHCI and chipset issues or bios.