Computer freezes

My computer freezes after 5 minutes of gameplay. i have to reboot my comptuer everytime i try to play cross fire.

anyone had this problem before?

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System Information

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Time of this report: 11/26/2011, 12:52:21
Machine name: YAKAMATO-PC
Operating System: Windows 7 Professional 32-bit (6.1, Build 7600) (7600.win7_gdr.110622-1503)
Language: Norwegian (Bokmål) (Regional Setting: Norwegian (Bokmål))
System Manufacturer: FUJITSU SIEMENS
System Model: P5LD2-FM
BIOS: BIOS Date: 03/21/06 14:28:08 Ver: 08.00.10
Processor: Intel(R) Pentium(R) D CPU 2.66GHz (2 CPUs), ~2.7GHz
Memory: 8192MB RAM
Available OS Memory: 3200MB RAM
Page File: 2161MB used, 7034MB available
Windows Dir: C:\Windows
DirectX Version: DirectX 11
DX Setup Parameters: Not found
User DPI Setting: Using System DPI
System DPI Setting: 96 DPI (100 percent)
DWM DPI Scaling: Disabled