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Back when I wanted Empire, I followed the regedit trick to the letter of the law and it didn't work. I still got the message you just indicated. I'm not sure if it's my computer or windows XP or what. Does the regedit trick still work?

Ended up needing a clean computer in that situation. Problem is, I'm running out of clean computers.

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One clean pc that you can re-install xp on each time will work, as long as you don't use it for anything else.