So I recently bought a cheap version of windows 7 off ebay and got duped as it didn't have a real product key, however I now have a non genuine version of windows on my pc. I continued to use my pc for a while without a genuine copy and now I'm worried about my pc locking up because of it. What I want to know is are there any good legal sites where I can buy just a real product key or will I have to reinstall a proper version of windows 7 again, because I don't really want to have to go through the trouble of moving all my files back into the new OS from windows.old