S.T.A.L.K.E.R Shadow of Chernobyl Problems

Hello I have been having trouble with this game by it freezing in the middle of game play and also it crashing and going to the desktop. I haven't had this problem I updated it with the latest patch and still nothing it worked just fine until now can anyone help me?

Check out the PC Gaming Wiki page for the game. Always a helpful resource for trouble shooting games.