Help! No one can seem to figure this out

Processor Manufacturer: AMD
Processor Type: Athlon 64 3400+
Processor Speed: (same as Frequency? if so) 2200Mhz
Operating System / Service Pack: Microsoft Windows XP Professional 5.01.2600 Service Pack 2
System RAM: Physical Memory :1024 MB (2 x 512 DDR-SDRAM )
Video Card Manufacturer: ATI
Video Card :ATI Technologies Inc ATI Radeon HD 2600 XT AGP
Video Card RAM: 512 MB
Video Card Driver Version: Catalyst (not sure how to find what type)
Sound Card Manufacturer: SoundMAX
Sound Card Model: (not Sure how to find this)
Sound Card Driver Version: (Dk how to find)
Current Sound- SoundMAX Digital Audio.

Under display-
Drivers-
Main Driver- Ati2dvag.dll
Version- 6.14.0010.6719
date- 8/22/2007
Mini VDD- atimtag.sys
DDI version- 9 (or higher)

Sorry anyone who reads this, I’m not terribly computer savvy so I’m not sure how to locate some of the information, just tell me if I need to post any other information here. Thanks.

Problem- During gameplay at random intervals my game/computer will crash. It is typically during battle but has happened in town. It doesn't even seem like the game locks up, all that happens is my screen goes black I hear my computer go "click" and the system restarts. I have had this problem before and thought that it was related do to the overheating graphics card i had at the time. But recently I went out and bought a new card just to test this and it still happens. This issue has not happened on any other game, I tested CounterStike and World of Warcraft and both work flawlessly. I thought it might have been an overheating problem, partially because my old Radeon 9800 fried itself, but that was do to the fact the fan on the card failed, not poor circulation. I have downloaded a few programs to monitor heat and the typical temp on the processor (when I’m gaming) is around 52C and the mainboard temp is about 10 degrees cooler. The Graphics card temp is around 35C when I’m not gaming at around 45C when I am. I’m not exactly sure what the “safe” temp is, but one of the programs I have said it warns you if your computer is getting to hot. I THINK i have the correct drivers. . .

Also on a side note- I was also considering that it might be a soundchip issue, do to outdated an outdated driver or something. I have been looking around all day trying to find something or someone who can help me figure out how to check this and how to fix it.

Anyone have any ideas? I have been asking around for along time and so far no one has been able to figure out what it is. So if you manage to fix this, you are a god among men lol. I’m dieing to get this fixed. I really appreciate any ideas you can throw my way.

Thanks so much for any ideas
-Savassan

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Adition information that Could be relavent but im not sure-
The Minimum System req for NWN 2 MOTB
-OS- Windows XP
-Processor- Intel Pentium 4 2.0GHZ or AMD Athlon XP 2000 or Equivalent
mem- 512
Dark Disk Space- 5.5GB free
Video- 128 MB shader Model 2.0 Compatible Video Card
DirectX- 9.0 Or higher