Have some problems with CS and Nvid 6800

[12monkeys]

I have nVidia 6800 ultra and when i'm playing Counter Strike I have lines all over the place
I dont know if any1 has the same problem but i already tryed several nvidia card FX, 6800 gt, 6800 gt overclocked and now ultra and they all have same thing but when i change dxlevel in game console it seems to help any body can explain

[GuruJockStrap]

If it's white lines, that problem is a driver issue.

Download and install the 67.02 drivers, which are optimised for HL2 and CS.