I have installed W7 Professional with a Dell OEM CD that came with a Dell Optiplex PC, on a clone PC, as the Dell ended up with a burned up Main Board and was scrapped. It worked fine for a while and I now get the message "This copy of Windows is not Genuine". Do I have to buy a new copy of W7? If I do, can I just run a repair on the current version with the new copy of W7? I don't want to loose my setup! What do I get if I make it Genuine online? I want to buy what is right and am afraid that if I do the online thing and have to reload the system, I'll be in the same boat.