Stalker Clear Sky shutdown ?

[m_fighter]

HI. My system just shutdown while playing Stalker Clear Sky. It was the first time this has ever happened. The game didn't crash. the system just shut down completely and i have install 9.1 drivers. pls help thanks you

Custom Built
Processor: Intel Core 2 Duo CPU E8500 OC 4.0GHz
Memory: GeIL 4GB (2x2GB) PC2-8500C5 1066MHz
Hard Drive: Samsung SpinPoint F1 1TB SATA-II 32MB Cache
Video Card: Powercolor ATI Radeon HD 4870 X2 CrossFireX
Monitor: BenQ FP241W Z
Sound Card: SoundMAX Integrated Digital HD Audio
Keyboard: Logitech G15 Gaming Keyboard
Mouse: Logitech G9 Gaming-Grade Laser Mouse
Operating System: Windows Vista Home Premium Service Pack 1 64-bit
Motherboard: Asus Rampage Formula Intel X48
Computer Case: Coolermaster RC-1100 Cosmos S

 

[neoboy]

So is the game still crashing the PC? Is the system working fine otherwise?