Apparently, iTunes users who hopped on the Vista train had a little trouble playing their purchased tracks, getting slapped with a big, fat "computer not authorized" warning whenever they tried to listen to JT's latest single. Apple has rolled out the "iTunes Repair Tool for Vista 1.0" in response, allowing users to play on, worry free.

It's worth noting, though, that the original workaround—to run the program as an administrator—points to an issue with Vista's new user account setup, so it's a problem we may see popping up in other apps in one form or another. – Matt Buchanan

iTunes Repair Tool for Vista 1.0 [Apple]
Apple offers iTunes fix for Vista users [iLounge]

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