I recently added Windows 7 Ultimate 64 onto my USB drive, but when i was in BIOS on my PC it couldn't find Non-Uefi USB drive(which i got W7 on). I clicked on #1, #2 and #3 boot priority but i could only find "UEFI" version of the USB drive and my main DIsk in my PC. I've tried everything but i don't understand why I can't find non-uefi USB drive on the priority list. Please Help me.