I've just upgraded a friend's computer, stuck in a new motherboard and given him a nice new case for it all. The problem is, when we come to boot it and log in, it says that the computer cannot be used until Windows is reactivated. It goes to the activation screen, but then comes up with a message saying that Windows is already activated. It then logs you out, and the whole process repeats.
We can get it into Safe Mode, but what we really need to do is force it to go through product activation again, so it will pick up the new hardware key. I'm sure I've seen this done before with a few commands, but I can't find them anywhere. Can anybody help me out with this? BTW, it's a legal copy of Windows XP home OEM we're dealing with here.


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