Hello,
no problem here with XP Media center, but i made a system restore point before applying the SP3. No problems up to now, all games and Office progs running.
I have to say despite my usual Windows bashing this XP one has turned out to be one stable platform. Not even Win 2000 has been as reliable as this. Windows 98 was a pain in the a$$, but i used IBM's OS/2 at that time.
I hesitate to get Vista though, i do not see any advantage - those eye-candy aero-look thingiess can be applied to XP without even needing as much ram as it uses in Vista
Greetings,
Catfish