G400 problem!

[Acme]

I have a problem with my dual headed G400. I have in windows,internet, games, problem that appears. The screen start to have vertical line with black and the computer stop crash.But the mouse stil mouve in a strange boxes. I have downloaded the newest drivers and bios. It is the video card. Because when i try ather card i have no problem. I now ther are the same problem posted. I posted a another one because i am tayerd of this problem. I have a celeron 450Mhz Asus P7 motherboard with 128 Mb of ram a sound blaster value,a US robotic voice modem (ISA).If that can help.

[gbm]

Does the probleam appear also at the default bus/cpu clock speed?