I have just recently moved and am trying to figure out what to do. I have an almost new system with Win 7 Home on it, but haven't made a backup. Now I want to install Win 7 Ultimate but can't located my product key at all. Threw too much stuff together when moving to my new address, and now can't locate the box or product key. IF I try to load Win 7 Ultimate without my key code will it even install, right over the Win 7 Home which is on my laptop now??