Hi, was recently forced to rebuild my windows XP partition on my HTPC meaning a complete reinstall. What I found when updating to the latest ATI drivers that my h264 decoding seemed to be broken on MPC HC. Lots of dropped frames with a massive amount of jitter. This only seemed to be fixed when I downloaded the ATI Catalyst 9.1 drivers from Guru3d. No idea why but hope this helps someone. Oh..if you haven't read my .sig, the card is a 2600XT.