A while a go on an Alienware that came with a genuine copy of W7 i had to re-install but i wasn't able to do that using the recovery disc so i temporarily put a pirated copy of W8.1 Pro 64-bit and now that i bought a genuine copy i'd like to ask if anyone tried to use a legit key on one of those pre-activated copies? is it as simple as changing the key and that's it?