So that pretty much sums it up. I have an ACER ASPIRE E17. I attempted to use Unbutu as an alternate (not side by side) OS. When I didn't care for it, I wanted to revert to my Windows 10. My computer will download and install Windows 10 using the USB legacy option. When attempting to change BIOS to UEFI upon bootup I get a message that boot record can not be found. Can you give me direction as how to go about fixing this mess? I've installed 8.1 and then windows 10. I was even able to activate windows but still I can't seem to get it to run in the UEFI boot. I feel as if I'm kind of in an area that I don't know what it is that I don't know.