PC Reboots

[Wield_II]

Hello,

Ill keep it short.
My PC reboot's every once in a while when I'm in a game, not only Regnum
alot other game's to. I'm just wondering what would cause this, any genius to awsner my question?

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CPU Type: 2x Intel pentium III Xeon
CPU name: Intel(R) Core(TM)2 Quad Q8200 @ 2.33GHz
CPU Clock: 2339.74 MHz (original: 2333 MHz)
CPU Multiplier: 2.5x
CPU FSB 935.91 MHz (original: 100 MHz, overclock: 836%)

Videocard: ATI Radeon 5700 HD. (Recently updated)
Motherboard: 45 oC (113oF)