Look in BIOS, and find your AGP settings.
Theres alot of issues like that with the 9600 series
, i used to have the same problem until i upgraded.
Your best bet would be to format and start over.
But first check things such as fastwrites, turn them off see what difference it makes.
Also changing your AGP Bus From 8X to 4X might help if possible.
As a last resort check the fan and heatsinc on the card to see if it is spinning properly. U could always try putting a bigger one on
You might find your answer here
its an old thread i used when i had the same problem
http://www.opengl.org/discussion_boards ... 03657.html