I have done a lot of research on this (these forums included), and I think that this simply isn't possible, which is frustrating. Godamn microsoft and their stupid way of handling 8.1 I have a genuine Win 8 OEM key (purchased from Scan.co.uk, not extracted from a pre-installed OS or anything) I can install Win 8.1 Pro with a generic key, but when I am set-up, if I try to activate using my legit 8 key, it tells me it won't work with this version of windows. I also have an 8.1 Pro upgrade key, which doesn't work either. Is my only recourse to forever have to install 8, and then upgrade to 8.1 afterwards? I really wanted to have it all on a single installation disc. As I said I don't think it's possible, but if there's a method to activate it that I haven't found this is my last resort here. Thanks in advance.