Games Suddenly Cause Restart On My Pc ! {SOLVED}

PES 2011 makes my pc to restart after minutes of playing…
edited: it happens to my other games like pes 2008 too.
my gpu is nvidia geforce 8600gts
intel pentium d dual core 3.20 GHz
2gb ram ddr3
is there problem with my gpu or power supply?

PLEASE HELP (
SOLVED: that was because of my low power’s fan speed due to dust.
Answer #1
when was the last time you updated the video drivers?
Answer #2
dear , now i find out that it happens to my other games too gpu driver version: 258.96
i could play games yesterday without any problems, but this morning i could hear the sound of noise or something but couldn’t realize where it came from…
Answer #3
Could be a heat problem.
Download program called speedfan or hwmonitor, run one of those or both before starting up a game.
While you are gaming alt-tab to your desktop to see the temperatures of your graph card, if the temps are to high then it’s most likely that overheating is your problem.
Also try to make the inside of your computer dust free because dust is one of the major overheating causes.
Answer #4
i got hwmonitor but it does not show my power fan speed, when i look at the fan of my power it moves really slow like 12 RPM or something like that !
Answer #5
i’ve added a pic from hwmonitor to my first post,
Answer #6
You toke those prints while playing?
Answer #7
@Speed! : no
Answer #8
Check you temps while playing.
Answer #9
i also think its temperatures, as this is usually what happens :p clean out your system if its realy hot !
Answer #10
thanks guys! problem solved, that was because of my low power’s fan speed due to dust.