Windows Media and other proggy's dont work as they should

[ARMAN]

I am not very good in PC's and need some assistane from some of you guys, there is lots of experts as I saw

After installing GeForce FX5200 128MB in my PC WinMedia9, DivX player, Poweer DVD player, video proggys stopped working as the should - how to explain that... the video is jumping every 2-3 seconds 5-10 seconds in front, so if you undestand - it is impossible to watch the video. Its going fast too, actually it looks like if you hold "forward" button on your VCR.
The only program that works normally is WINAMP (realmedea and quick time works fine too) but some files dont work with it. And in Winamp I play DivX coded vids just fine.
Also Rally Throphy dont work as should, it has simular problem as players.

Anyone know what to fix to make it work?