Preface: I'm building my own computer from scratch after having headaches with my current one (a Dell) for about 4 years. Seeing since it's come from Dell, they've saved me the pain of installing Windows 7 myself, and have also handily provided me with a sticker that displays Proof of License and Certificate of Authenticity. On the top left bears the line "Windows 7 Pro OA" - from the research I've conducted I have come to the conclusion that OA means OEM (someone with experience please confirm), or non-transferable (again, please confirm). However, from other sites/forums I've been on, people have been saying that I can use the same Windows 7 Key on different computers, but only on one at a time, and I must deactivate the first copy before registering it again. This advice logically (at least in my opinion) makes sense, because say the hard drive that has the original copy of Win7 crashes, and I get a new one which I'll probably have to reinstall Win7 on (although, being the amazing company they are, Dell will probably just recover any data and put it on to a new formatted hard drive for me). What I've also found is I can use any Windows 7 Repair/Install disc and put that into the new computer, and enter in the old key (assuming I've deactivated it on my Dell computer, and I have internet connection). What I've also found out is I can create a system image backup on to a flash drive and restore the new computer through this system image: from Page Start. As far as I'm aware, this isn't illegal as I'm not distributing the software nor am I abusing it by using it on multiple computers, but using the same product key to move my copy of Windows 7 from an old hard drive to a newer and faster SSD. Any help on this topic would be great.