I’ve had an intermittent problem with Windows Media Center ever since I bought my new WinXP PC in October. Every once in a while Media Center would cause a general protection fault while exiting.
The culprit was the HP DVD player software that was pre-installed (it’s a private labeled version of CyberLink PowerDVD). I Replaced it with WinDVD a few weeks ago and the GPF’s have stopped.
Paul Hutchinson's Blog 