Setup now requiring EFI


  1. KLund1
    Posts : 43
    win 10 x64
       New #1

    Setup now requiring EFI


    I corrupted my win10 install with a bad driver update. I updated 5 drivers at the same time, Ya, I know bad idea.
    So I pulled out my USB stick with an older win 10 iso on it. I have used this version twice before.
    I booted to that USB stick,and started the win10 install. I reformatted the win 10 partition for a clean install, as well as the little 462mb partition.
    Note the SSD that had win 10, also has Win 7, and win 8.1 bootable partitions.
    Now I get "The selected disk has a MBR partition table. On EFI systems, Windows can only be installed on a GPT disks."
    I have never had this before during an install.
    My system is a custom built machine, with a Asus P8Z77-V Deluxe MB. I have not made any changes to any MB settings in over a year.
    What can I do to reinstall win 10?
    thanks
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  3. NavyLCDR
    Posts : 18,432
    Windows 11 Pro
       New #2

    When you boot from the Windows 10 USB do not select the option that says UEFI USB. Select the option for just plain USB. This is when you are selecting the device to boot from before the computer actually boots from anything.
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  4. cereberus
    Posts : 15,485
    Windows10
       New #3

    Above may not work - not all BIOSes give option for eufi USB or MBR USB startup.





    In any case, you should use latest version using

    Windows 10

    Also make sure bios is set to legacy bios install.
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