Never had a problem like this before and not sure what to do besides trying microsoft support again tonight which is less than stellar... Have an older Dell laptop with windows 7 that came installed on it. Finally ended up doing a clean install a couple of weeks back and got the invalid key error. The laptop functions but im at a point I would like to take care of this because it is indeed a legit copy. I think I got one correct answer from a microsoft agent who said he was going to fix it before mysteriously disconnecting himself in that dell is blocking me from activating it. So I figured the ISO I used won't work with the OEM license I pulled with produkey since the actual sticker is almost invisible. What are my options to get the key activated?