BlueMak

Do you play any other graphics intensive games like this one? I wonder if it is a STALKER only problem because of the game or perhaps your PC over heats or perhaps your memory has problems.

Also, try for AA and AF choosing the option "let the application decide". I seem to remember that Stalker had a problem that if you forced some AA / AF then the game would crash.

Also, make sure you read the release notes of the graphics drivers in case it is a known issue with the graphics card that require something special to be done.

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"You go into Afghanistan, you got guys who slap women around for five years because they didn't wear a veil,
You know, guys like that ain't got no manhood left anyway. So it's a hell of a lot of fun to shoot them." - Lt. Gen. James N. Mattis