I had used 7loader 1.3 or 1.4, and activation was fine. Then one day, my windows gave me the message that mine wasn't activated. What gives, why would it just randomly happen?
Download "Magic JellyBean KeyFinder" and Post the key which comes up for windows 7, (you can post it as it is an OEM key not a retail and these are already in the public domain and on this website) Did you add OEM details with the activation?