I recently got a 24" monitor that can do 1080p, but mkv files w/ h264 video (720p up to 1080p) all run slow on my computer. The audio doesn't sync up w/ the video, etc. I have a P4 3.0ghz cpu, and I was thinking of upgrading to a core 2 duo e6600, but then I remembered I have a video card that has AVIVO which supposedly does h264 hardware decoding. Problem is, MPC, VLC, etc. don't support hardware decoding (as far as I can find) and nero showtime and cyberlink power dvd (which support h264 decoding through avivo) don't support .mkv containers. And I'd rather not use coreavc. Does anyone have any ideas of how I might get these mkv files playing smoothly with my setup?