Hello, I am running a rig with windows 7 64 bit, a phenom II x4 3.4 ghz processor, 4g ram, and two radeon hd 5770's. Ever since i installed windows 7 a few days ago my fps have dropped and textures flash and blink when crossfire is enabled, Could their be a reason for this? I have DL all of the crossfire profiles and have told CCC to use pre made crossfire profiles but still no dice. I was able to run the game on ultra when i was running windows xp (32bit)(in crossfire). If anyone has any suggestions that would be sweet.

Have you updated your graphics drivers to the latest version and the correct ones for win7? Did you re-install steam and the game after the windows install?

yes i have updated my video drivers and reinstalled both the game and steam and still no dice. I should note i downloaded the hd texture pack, and the problem occurs when the textures are enabled and disabled

I also have the same problem running Win7 and HD5770 Crossfire with Catalyst 12.1 drivers, and it seems to be the drivers that are causing the problem from what I read on AMD forums, so not much to do except wait for a fix as even 12.2 beta drivers don't resolve these issues, and rolling back to 11.12 drivers didn't help either.