Switch the HDR to Bloom under options in the options menu before yous start the game. This is a temporary fix till they fix HDR, this will fix most problems people have been having with lag, seeing dots and boxes, and taring, and from what i can tell it makes the game more stable so it doesn't crash as much for those of you who have been having this problem.

Someone else figured this out as a solution to their pc crashing problems and i used it when I couldnt get above 1-3 FPS during that first major gun fight.

Please bump this to keep it on top so other people can get these problems fixed fast.

i'd like to add this has only reduced the problems above but not a solution.

Here is a solution that definitely works:

http://www.gamesas.com/index.php?/topic/1128198-fix-for-the-white-flashing-and-black-spots/