DXdiag and graphics problems

[Damo79]

I have been trying to sort out my mates computer. When playing games like Call of duty 2 and BF2 there are big chunks of lines coming all over the screen. When i checked out the DXdiag draw tests the cube was spinning really quick and couldnt really tell what it was. I reinstall the Directx 9.0c from the MS website but made no difference.
I have recently upgraded his compaq with a Nvidia 6600 asus card and 1GB of memory. Any one got any ideas???

Thanks

Damo

[Damo79]

Even when the grpahics are turned down there is still chunks of lines over the screen. The machine is a 2.5 P4 and after the card and memory going in it more than meets the requirements.
Is the cube related to how the card is drawing graphics then???

[Damo79]

It does look like that but when u go into the test direct3d the cube is spinning really fast and u can hardly see what it is. This is what i think is causing the peoblems with games. when the game is running, be it BF2 or COD 2 the grpahics are just a mess.