TV Tuner Playback Jumpy In MCE2005?

I have a computer in my livingroom with:

Biostar T-Force 6100-939
GeForce 6100 Onboard Video
939 Socket AMD Ahtalon 4400+ Dual Core
2GB PC3200
Generic PSU (400 Watt)
AverMedia Ultra TV 1500 Tv Tuner
MCE Reciever & Remote
42" HDTV
Hitachi Deskstar HDD


I am using Media Center Edition 2005 for Oss.. I am using the newest video drivers for XP (cant find any for MCE). I am using UltraTV_1500_MCE_v1.0.6.14 drivers for the TB tuner (its what I got with it, and the only one I can find), and I am using WinDVD5 for the decoder.

Everything has worked flawlessly for me a long time. Then it was getting kinda slow to respond so I decided to reformat like I do every few months.

Well now when I watch tv its all jumpy, and it pauses, and skips, and does not play back well. I have tried recording and it does the same thing. I tried using Nvidia DVD decoder with the exact same results. I tried using older video card drives that worked before and got the same results..

and sugestions?

thanks

well. the OSS i was using was gettin slow.. it was messed up some how. I purchased a new copy of MCE2005 and installed it and it runs much much faster with no lockups. I thougth for sure that would be the problem, but it was not. it still does it. I have all drivers installed.. still jumpy..

well. I know the card itself is not the problem.. when I watch tv in a diffrent program its not jumpy at all..

I have added another gig of ram, and a 7900GTO to the computer, going to take another stab at it today 8 months later.