Major audio related issue

[Matt]

Dear Sir/Madam,

I have been experiencing a major sound problem since a few months.

After a few minutes of gameplay in any computer game, I start getting scratchy and distorted noise. I don't get this problem when I listen to music or watch a video. It does not stop unless I reboot the computer.

My computer is:
AMD64 Clawhammer core 3500+ @ 2,2 ghz
1024mb Kingston (512x2) Dual-channel DDR400 PC3200
Gigabyte nVIDIA 6800GT 256mb GDDR3
120GB Western Digital 8mb cache.

All latest Nforce 4 drivers, Forceware drivers, Direct X 9.0c releases and miscellaneous drivers.

I have tried uninstalling and reinstalling the drivers to no availability.

My speakers are Altec Lansing VS2120.

My motherboard is ASUS A8N-SLI with onboard sound.

Feel free to ask for any additional information.

I use the latest Nforce audio drivers that were included in the recent Nforce 4 6.86 release.

DxDiag:

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System Information
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Time of this report: 7/9/2006, 23:55:16
Machine name: MATHIEU-T
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 2 (2600.xpsp_sp2_gdr.050301-1519)
Language: English (Regional Setting: English)
System Manufacturer: System manufacturer
System Model: System name
BIOS: Phoenix - AwardBIOS v6.00PG
Processor: AMD Athlon(tm) 64 Processor 3500+, MMX, 3DNow, ~2.2GHz
Memory: 1024MB RAM
Page File: 508MB used, 2977MB available
Windows Dir: C:\WINDOWS
DirectX Version: DirectX 9.0c (4.09.0000.0904)
DX Setup Parameters: Not found
DxDiag Version: 5.03.2600.2180 32bit Unicode

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DxDiag Notes
------------
DirectX Files Tab: No problems found.
Display Tab 1: No problems found. DirectDraw test results: All tests were successful. Direct3D 7 test results: All tests were successful. Direct3D 8 test results: All tests were successful. Direct3D 9 test results: All tests were successful.
Sound Tab 1: DirectSound test results: All tests were successful.
Music Tab: DirectMusic test results: All tests were successful.
Input Tab: No problems found.
Network Tab: No problems found. DirectPlay test results: All tests were successful.