Random Crashes/Lock ups

Well this is a 1sr for me... posting in the tech help area with a tech issue.

Recently ih ave been experiancing random crashes/locks ups when teaming with other players.

What happens is that CoX starts to slow down and get unresponsive, and then just totally locks up the PC. At the same time i start getting a high pitched sound through my speakers.

I end up having to reboot my PC, and then it *might* resolve itself. Sometimes I can be teamed up for several hours, or i can just last 10 minutes (or even 10 seconds) whilst teamed.

Ideas? Thoughts? Solutions?

DxDiag
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Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.080814-1236)
Language: English (Regional Setting: English)
System Manufacturer: NVIDIA
System Model: AWRDACPI
BIOS: Award Modular BIOS v6.00PG
Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 4600+, MMX, 3DNow (2 CPUs), ~2.5GHz
Memory: 2048MB RAM
Page File: 777MB used, 5196MB available
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DxDiag Version: 5.03.2600.5512 32bit Unicode

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Display Devices
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Card name: NVIDIA GeForce 7900 GS
Chip type: GeForce 7900 GS
DAC type: Integrated RAMDAC
Device Key: Enum\PCI\VEN_10DE&DEV_0292&SUBSYS_2A6A107D &REV_A1
Display Memory: 256.0 MB
Current Mode: 1600 x 1200 (32 bit) (85Hz)
Monitor: Default Monitor
Driver Version: 6.14.0011.7516 (English)
DDI Version: 9 (or higher)
Driver Attributes: Final Retail
Driver Date/Size: 5/2/2008 22:46:00, 6108160 bytes

I have tried dropping back my gfx card drivers (as shown by the date) but the problem is still around.

It sounds like it might be sound problem. Try playing with sound disabled. If it's stable then you've found the cause.

Have you updated your sound drivers recently? You might have got them in Windows Update.

Checked on Creative's website, and i am using the most up to date version of them.... will install the ones on the CD just to double check though