Video Stutter in Playback

[backset]

I just set up an new HTPC, P4 2.6 Ghz 512mb ram with a 160gb Maxtor 8mb cache 7200 rpm HD and I installed SageTV. I'm a sagetv veteran and I have 2 other PCs running it perfectly. The new pc cannot playback the video without stuttering and jerky frames. I can play the same file across the network on my other pc and it is fine. Obviously the recording is fine, and the hard drive is ok. I tried using sagetv, zoomplayer, and PowerDVD as the playback software, all display the same problem.

Does anyone have any ideas as to why this is happening?

[Narflex]

Video driver or display settings most likely...I'd got that route first.

[backset]

I'm running catalyst 3.4 on a ATI Radeon 8500. I can try 3.5 or 3.6 I suppose. The screen is set to 848x480 with Powerstrip. Other than that I'm not sure what video settings to tweak.

I did some checking and the pc can play AVI/DIVX and MPG/SVCD/VCD without a problem. The problem seems to be with the high data rate of my recordings. If I lower the bit rate the playback is smoother. I could try reformatting the drive with a larger cluster size but it wouldn't explain why a network computer is able to play back the files with no issues.

[backset]

It was the cyberlink filter. It works fine with WinDVD5. Strange.