Xp valid product key unauthorized after update (valid for 4 years?))

I have a win xp media center validated for over five years, and since a recent update *(at microsoft)after rebooting I got the must activate screen. However, with a valid product key Microsoft can not explain why this has happened. this has been my old faithful pc and I've never had this problem. Help/; microsoft keeps giving me the run around.
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  1. Have you simply tried to enter the key that should be on the side of your machine? If that doesn't work, and provided that you do in fact have a legal copy of Windows, it may be possible to start up in Safe Mode and use a product like Key Finder to determine your product key, unless it has somehow been removed from your registry.
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