Shutting down sound when playing games

I have a problem with my PC... It happens when i play graphically demanding games,such as Skyrim,Batman:Arkham City,Bad Company 2... I start playing and after couple of minutes i hear a shutting down sound and my PC freezes... Sometimes i can start Task Manager and exit a game,but sometimes it happens that I can't do that and i have to restart my PC... I was thinking it could be overheating problem,but i would also like to know what makes that sound,is it HDD,CPU,or even Motherboard... And i forgot to mention that when i play low demanding games,for example Football Manager 2012 it just plays normal,no shutting down sound,nothing...

My PC specs:
GeForce 6100SM-M2
2GB DDR2
MSI Radeon HD4850 1GB
WD 250GB
AMD 5200+

P.S. I really had no clue in which category to put this..
2 answers Last reply
More about shutting sound playing games
  1. which windows operating system are you running?
    You can check the event log to find out why windows shut down usually.
  2. I am running Windows 7 32bit... Can you explain me how to check event log?
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