unhandled win32 exception occured in svchost.exe

Hi, I'll start by explain my environnement, maybe it could help.

A Win2003 domain with 2003 servers and Xp SP2 clients. (around 300 computers)

All our computers are Dell. I don't know if it is a Dell related problems or Microsoft related.

This error (unhandled win32 exception occured in svchost.exe) did start when we start buying Core2Duo computers. (Optiplex 745, and Lattitude D620, Core2DuocComputers)

By reading some post and forums on the internet, I figured out (I think) that is related with Windows Update and High Definition Audio device.

http://forums.techarena.in/showthread.php?t=579405

The problem generally occurs when the computer starts. After the startup, Windows launch his Windows Update, and at the beginning of the process the error appears. This error cause the most important svchost services to crash and everything goes bad after, until I reboot. After the reboot, Windows Update start again and goes the same error, over and over again. Ive been able to bypass this by disabling the audio device in the bios (but I don't really to keep it like this!). Another way is to disable the Windows Update (not another great idea). It looks like a conflict between High definition audio and Windows Update.

I have installed the drivers from the Dell web site, for my model, but no change.

I know that you gonna say that is Microsoft related, but it looks that im not the first one that experienced this behaviors with Dell's computer (by looking at this support forums). Any help will be appreciated.

I have nearly 20 computers and 5 laptops that become unusuable when these errors starts.