If it's too difficult, train yourself with an older and/or easier game first.

As for STALKER itself, Shadow of Chernobyl was very buggy, too. Have you played the game without a crack? I think that will crash, too. So wait for some official patches instead.
By the way, there is a software (Google for it) that can unpack the game archives. Unpack GAMEDATA\CONFIG\CREATURES\actor.ltx and GAMEDATA\CONFIG\system.ltx and hack them to play a bit easier. The comments are in Russian but the variable names speak for themselves. (This is for Shadow of Chernobyl but Clear Sky probably still uses the same files.)
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Joe Forster/STA
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