Lots have, and it's a fairly simple upgrade. The usual caveats apply: Backup
that which you do not wish to lose, just in case. Check hardware for
compatibility and download any needed drivers ahead of time (before you buy,
borrow a friends XP CD and run the compatibility wizard on it, this will let
you know about any known issues). More on upgrading here: http://aumha.org/win5/a/xpupgrad.htm
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Best of Luck,
Rick Rogers aka "Nutcase" MS-MVP - Win9x
Windows isn't rocket science! That's my other hobby!