STALKER - Shadow of Chernobyl keeps crashing.

[ChuckNorris]

Hi people, I have been a gamecopyworld addict for such a long time, but I just registered for the forums. I have a legal store bought version of Stalker.
I Have
Running W7 Ultimate.
64 Bit
4 gigs of RAM
AMD Athlon(tm) II X4 620 Processor (4 CPUs), ~2.6GHz
DirectX 11
2 x ATI Radeon HD 4670 Video Cards

It kept crashing in the begging of the game, so I googled it, and most people solved the problem by running the game with the app. LaaTiDo. and yes it helped. But now I am having the crashes again. I don't want to lose my game. Please help me. I have patched to the latest version, the game I mean. My video cards have the latest patches too.

Here is one of the error messages I get.

Faulting application name: XR_3DA.exe, version: 0.0.0.0, time stamp: 0x472217f9
Faulting module name: unknown, version: 0.0.0.0, time stamp: 0x00000000
Exception code: 0xc0000005
Fault offset: 0x3f800000
Faulting process id: 0x103c
Faulting application start time: 0x01cab28dcc2a6c81
Faulting application path: C:\Program Files (x86)\THQ\S.T.A.L.K.E.R. - Shadow of Chernobyl\bin\XR_3DA.exe
Faulting module path: unknown
Report Id: 2715be33-1e82-11df-8a46-90e6bacdff1d