I have not gone real deep in to UEFI. I have a Dell Optiplex 3010 that booted to the "You need to repair Windows" screen. The only CDs that would boot are ones that have a UEFI option. I went in to the BIOS on this computer and UEFI is turned off yet it would not boot a standard Windows 32-bit CD. I double checked every UEFI option in the BIOS and it is turned off. Any ideas?