From what I have learned, with UEFI, GRUB does not overwrite the windows bootloader in the EFI partition and is stored elsewhere. Ubuntu is not my thing, so now I want to remove it along with GRUB.
Boot the Windows installer legacy and everything should work fine without having to erase your disk and switch to GPT.Īlternatively, if you want to re-do your disk as GPT, you could follow the link in the comment that joeqwerty left for you. I have Windows 8 pre-installed, and then I installed GRUB with Ubuntu. Usually there will be two separate options in your BIOS boot order configuration, or your BIOS boot menu, one to boot the USB in legacy and another to boot it UEFI. You should be able to boot the USB installer in legacy mode. Most likely what's happening is when you boot from your Windows 10 install USB, you're booting it UEFI mode, so it assumes you want a UEFI-bootable installation, then it sees an MBR partition table on the disk and says "this isn't going to work".
Since your disk is MBR now (according to Windows anyway), you know you're booting legacy at the moment. Legacy requires the boot disk have an MBR partition table, while UEFI requires it have a GPT partition table. If possible, I want to restore the system instead of reinstall because of the data and settings.Essentially, you can boot two ways nowadays, legacy BIOS or UEFI. I'm looking forward a clue on solving this problem.
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