Overheating? Trouble!

So I explained my problem, I played a lot before GuildWars And my PC crashes after a certain time, and such when I played a second game, or when I made great stuff on my computer!

How's this going this crash? ?

The screen that freezes, the mouse can no longer move and then my pc made a noise like "click" and it restarts!

My configurations! :


Computer:

Operating system: Windows XP Professional Microsfot.
System Service Pack: Service Pack 3.
DirectX: 4.10.00.600 (DirectX 10)


Motherboard:

Name Processor: AMD Athlon ™ 64 Processor 3500 +.
Processor Type: Unknown, 2200MHz.
Name of the motherboard: Unknown.
Chipset of the motherboard: Unknown.
System Memory: 1024 MB.
Type BIOS: Award (02/10/07).

Video card: NVIDIA GeForce 7300 (512MB).
3D accelerator: nVIDIA G72.
Monitor: Plug and Play Monitor

Temperatures:

Motherboard: 36 ° C (97 F)
Processor: 25 ° C (77 F)
To: 6 ° C (43 F)
GPU: 29 ° C (84 F)

Knowing that I clean (remove dust) in the power supply, graphics card fan of the motherboard, I added a fan to the graphics card.

That is if you want more information on my computer do not hesitate, I seek the source of the problem to solve!

It looks like a psu bug !

While I clean the dust in the limping power: /