Hey, I've got this one weird problem from quite some time and I'm pretty much out of ideas how to get rid of this issue. When I'm playing Quake 3 or Quakelive I am showed constant 125 FPS, but the game gets a bit choppy from time to time. It does not generate any lags and the FPS meter is still at it's normal 125. But it surely gets jerky every now and then. It usually lasts from a minute to about two or three (I think) and then all is normal again for another 5-6 minutes. It's only a little bit choppy but it really annoys you after an hour of playing :/

I've got a C2D 4300 @ 1,80 ghz, GF 8800, 2gb of ram, and a windows XP prof. I already tried turning off skype, avast, and other applications but it doesn't help at all.

Right now, any help would be really appreciated as I am totally out of any clues on what could be the issue and how to solve it :(