I started the game once before I had finished downloading (steam messed up somehow). The game was very poor in this state, as a result let Steam validate and download the missing files. I started it another time and it worked immense. However I become aware of something strange sounds. For example, in the heavy fighting that fire the gun once, however it seems that several shots. The orcs' cries of repetition (stuttering) at least twice, which sounds like "Ma-Space Space Marines!”However, my FPS is very low, even at the highest point; the game is very playable, despite the sound problems. Rebooted my PC for a moment after this and played the demo another time through similar results. After a second round through 280.26 drivers, I have to mention that I misnamed the difficulty. The sound stuttering is based on the weight of the fight; however there is no major loss of FPS. The game worked exactly like it did with the 275.33 drivers.