Video Game Graphics Problem

[hosagi]

For some reason when ever I play PC Games my graphics seem to go haywire. I have no otherway to describe my problem. The only time this happens is when I play PC Games, it does not seem to happen when Im watching Movies Anime or searching the web.
My PC Specs:
Windows XP Home SP2
GigaByte GA-K8N Pro-SLI
AMD Athlon 64 3200+
2gbs RAM DDR400
160gbs Western Digital Hard Drive SATA
eVGA Nvidia GeForce 7800 GT 256mbs PCI-E x16
AOpen 16x16 DVD-RW
Sony 16x16 DVD-RW
Cox High Speed Cable Internet
19" LCD-TFT Monitor

 

[Rik]

Have you updated graphics card and mobo drivers??

Also, have a look at dxdiag by clicking start, run then typing dxdiag and have a look at the display section for any problems!!!!

 

[hosagi]

i have the latest MoBo Drivers, current forceware(93.71), windows is uptodate on all patches and i have the most recent directx(9.0c SDK) version. ive run both directdraw and direct3d tests that are in the dxdiag program and both passed. perhaps i should explain the graphics problem a little better. i can still play the games its just that some parts of the characters(pc and npc) or scenery flickers even on lowest detail settings