Just got a new thinkpad and wanted to give it a fresh install from that start. The only problem is that I only got a key not a CD with the laptop. No problem I thought, I'll just use another xp cd that I have and enter the key that came with my comp. Well I've now found out the differences between retail and oem versions of the keys. Right now I have the other version of XP installed but I can't get updates becasue this key is already registered. I want to change the key to the oem one that I have. I there a way? Is this legit?