Laptop shuts down while playing game

I have a Hp Pavillion dv6000
Operating System: Windows Vista™ Home Premium (6.0, Build 6002) Service Pack 2 (6002.vistasp2_gdr.100218-0019)
BIOS: PhoenixBIOS 4.0 Release 6.1
Processor: AMD Turion(tm) 64 X2 Mobile Technology TL-60 (2 CPUs), ~2.0GHz
Memory: 1982MB RAM
DirectX Version: DirectX 11
Card name: NVIDIA GeForce 7150M / nForce 630M
this laptop is about 3 years old now.

so my problem is that every time i play my game (Soldier Front ijji) my computer just shutsdown. i dont know why. does anybody have any idea?
 
It might be overheating. Can you open up the laptop and clean out any accumulated dust?
 
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