I need to install Windows 7 on my ASUS T100TA which has a 32-bit EFI without Legacy Boot option. Windows 8.1 is very lagging, so why don't try install Windows 7?
First, I prepared 32-bit Windows 7 install USB, entered into BIOS, disabled Secure Boot, but the USb didn't boot.
I also tried other way: Created Windows PE 5.1 bootable USB with extracted Windows 7 ISO which successfully booted. I then opened Command Prompt and ran Windows 7 setup, accepted license, selected "Custom install", deleted ALL partitions from 32GB Flash drive, created new partition, but it can't install Windows 7 there (missing Intel SD Host Controller driver).
Can anybody help me unlock the Legacy Boot option or give me the BIOS-emulation bootloader?
Best Answer
Windows 7 needs BIOS INT10 to boot, in turn requiring CSM.
So, your only choice if you don't want Windows 8/10 is Linux. No need to even disable Secure Boot thanks to the Linux foundation shim most distros ship with.There are also reported hacks to make 64 bit OS load.EDIT: it turns actually out there exists hacks for booting without CSM!
EDIT2: UefiSeven has you covered completely now.