I reloaded WinXP Home for someone today on their Dell. I used an OEM version of XP Home I slipstreamed SP2 into along with the CD key on the sticker on their computer. Windows installed fine, accepting the key. I've used this exact procedure a million times without incident. But when I went to activate it, it said the key was incorrect and prompted me to enter it again. I double checked the key and re-entered it with the same result. WTF? I've never had it do this to me.