Same problem (580 GTX, Win7 x64).
Fix:
in game set Anisotropy x1
in driver force Anisotropy X16

P.S. Also have problem with RBR... black screen. Anyone know how fix it?

P.P.S. Solution for RBR and NetKar Pro - switch from fullscreen to window mode

Last edited by Chikvo, Tue 8 Feb 2011, 10:59. Reason : Find solution