CoX constantly crashing 5 minutes into game play

I've been unable to play for about a week now, tried several fixes including downgrading the video drivers to the basic microsoft and the nvidia one from the CD which came with my card all to no avail. I've monitored CPU/mem use while in play and they stay at about the same values, no spikes associated with the crash or ramping up of memory use the only thing I have been able to find is this from the event log:

Failed extract of third-party root list from auto update cab at: <http://www.download.windowsupdate.com/msdownload/update/v3/static/trustedr/en/authrootstl.cab> with error: A required certificate is not within its validity period when verifying against the current system clock or the timestamp in the signed file.

after some googling I found this is the cab file used to verify genuine windows, however this isn't in the event log for every crash, and I've downloaded the window genuine tool for XP and that says I'm fine...

any help would be much appreciated, heres a CoH Helpers log of my system in case it will help


---System information gathered by CoH Helper version 0.2.0.2---

DxDiag gathered at August 14, 2010 20:32 (+01:00)
Operating System: Windows XP Professional (5.1, Build 2600) Service Pack 3 (2600.xpsp_sp3_gdr.100427-1636)
System Manufacturer: System manufacturer
System Model: System Product Name
BIOS: Phoenix - AwardBIOS v6.00PG
Central Processor: AMD Athlon(tm) 64 X2 Dual Core Processor 5000+, MMX, 3DNow (2 CPUs), ~2.6GHz
Memory: 2046MB
.Net Memory Report: 1310MB out of 2046MB available
Page File: 5350MB (635MB currently in use)
C Drive: (Maxtor 6L250R0) 87383MB out of 239359MB (36%) free
D Drive: (Hitachi HDP725025GLA380) 110936MB out of 238464MB (46%) free
E Drive: (SONY DVD RW AW-G170A) zero-size drive
Windows directory location: D:\WINDOWS
DirectX: DirectX 9.0c (4.09.0000.0904)
DirectX Diag version: 5.03.2600.5512 (32-bit version)

Display Notes: No problems found.
Sound Notes: No problems found.
Input Notes: No problems found.

Monitor: Plug and Play Monitor
Monitor's Max Resolution: 1600,1200
Video Device Name: NVIDIA GeForce GTS 250
Manufacturer / Chip: NVIDIA / GeForce GTS 250
Video Memory: 1024.0 MB
Driver Version: 6.14.0012.5896
Driver Date: 07/09/2010 23:38:00
Driver Language: English

Sound Device Description: Realtek HD Audio output
Driver File: RtkHDAud.sys
Driver Version: 5.10.0000.5485
Driver Date: 01/01/0001 00:00:00


WMI Information
Motherboard Manufacturer: ASUSTeK Computer INC.
Motherboard Model: (empty)
Motherboard Product: M2A-VM
Motherboard Version: 1.XX
BIOS Manufacturer: Phoenix Technologies, LTD
BIOS Name: Phoenix - AwardBIOS v6.00PG
BIOS Version: ATI - 42302e31
BIOS Release: 20071026000000.000000+000


Registry Information for Current User
Resolution: 1440x900
3D Resolution: 1440x900 (Not using renderscale)
Full Screen: Yes
Maximized: No
Screen Position: 0, 0
Refresh Rate: 60Hz
Vertical Sync Enabled: Yes


Physics Quality: High
Maximum Particles: 23368
Max Particle Fill? 10.000
Physics Card Enabled: No


Anti-aliasing: 4x
Anisotropic Filtering: 16x
Texture LOD Bias: Smooth
Water Effects: Medium quality
Bloom: 1.000 (turned on)
Depth of Field Enabled: Yes
Desaturation Effects (Sepia) Enabled: Yes
Shader Detail: Medium?


World Texture Level: Very High
Character Texture Level: Very High
World Detail Level (Vis_Scale): 2.000
Entity Detail Level: 2.000
Shadows Enabled: Yes
Shadow Mode: Unknown (3)
Shadow Map Shader: Medium quality
Environmental Reflections: Medium quality
Advanced Occlusion Settings: No
Ambient Occlusion: Balanced
Occlusion Strength: Medium
Blur: Bilateral
Ambient Resolution: Performance


Gamma Correction: 1.000
Geometry Buffers (VBOs) Enabled: Yes
Suppression of FX When Camera Close Enabled: No
Close Suppression Range: 3.000
Show Advertisements: Yes

Audio Mode: Performance
3D Audio: No
FX Sound Volume: 0.355
Music Sound Volume: 0.000

Show Advanced Graphics Options: Yes
Overall Graphics Quality: 0.750
Reverse Mouse Buttons: No
Save Login Username: Yes
Transfer Rate: 176680 bytes/second
Current Game Version: 1800.201006040036.8T
Installation Directory: D:\Games\City Of Heroes\City of Heroes

Mod files in the Data directory
.\texture_library\GUI\Icons\Powers has 96 files
.\texture_library\MAPS\city has 1 file
.\texture_library\MAPS\Midnight_Squad has 1 file
.\texture_library\MAPS\Safeguard has 9 files
.\texture_library\MAPS\sewers has 44 files
.\texture_library\MAPS\static has 34 files
.\texture_library\V_MAPS\Outdoor_Missions has 9 files
.\texture_library\V_MAPS\Static has 16 files

are you running RivaTuner or any derivative tool such as EVGA Precision?

I'm running Nhancer (2.5.9) only mod I've made through that is to force DXT3 (openGL) to make it run a bit smoother, but thats been running at the same settings for near 2 months now, I hadn't thought of resetting everything on it though, will try that straight away

I've stopped Nhancer affecting CoX and now I'm blue-screening instead of just crashing to desktop, no associated drivers or programs with the BSOD, PCs still working fine with everything else, normal use, surfing, other games

*head tilts*

um.

Okay. uninstall the Nvidia drivers. run driver sweeper.

then re-install.

This is sounding like some kind of data corruption.

it's your sound drivers. you need to replace them.