I've successfully activated both Win 7 and Vista on same machine a few times over the past year, so I think I've got the hang of it. However, I recently restored a ghost image of my Vista install and now its prompting me to re-activate. Went thru some hardware changes recently (changed couple drives) so that may be it. How do I get re-activated? Tried re-using the same Dell cert and key but it didnt work. I know the cert + key are good since I just activated another PC with it yesterday.