Constant disk access caused by svchost.exe

Hi to all,

I'd like to apologize beforehand: I know that there are already quite some posts concerning this issue ( constant disk accesses) but none could help me out...

I have short constant hard drive accesses ( hearable) every 1. .3 seconds even though I don't do anything. This is very annoying and I am already trying to solve this problem for quite a while.

Here are the steps I've done:

I run virus scans ( McAfee, Norton Security Scan), AdAware and Search& Destroy. They didn't find anything malicious.

I disabled all possible processes using the Task Manager. I did the same for the processes started on Windows startup using msconfig and System Panel -> Administration -> Services ( I hope this is the right translation into English :) )
I've read in some forums that the terminal service might be the reason for these disk accesses, it is turned off as well but with no effect.
Nothing stopped the problem ( it doesn't appear when in Safe Mode though).

I finally figured out, using FileMon and the TaskManager, that it is a svchost.exe instance which causes the accesses. Using it's PID and the Tasklist command I got the applications behind this specific svchost:

Abbildname PID Dienste
svchost.exe 1800 AudioSrv, BITS, CryptSvc, Dhcp, ERSvc,
EventSystem, helpsvc, HidServ, lanmanserver,
Netman, Nla, Schedule, seclogon, SENS,
SharedAccess, ShellHWDetection, srservice,
Themes, TrkWks, UxTuneUp, w32time, winmgmt,
wscsvc, wuauserv

These are quite a lot of services behind one svchost... Here is where I don't know any further: Which of these services might cause the problem? And which of these may I kill ( and how)?

ps: When looking at FileMon, svchost mainly accesses the following two files:
c:\ WINDOWS\ system32\ WBEM\ Logs\ wbemess.log
and
c:\ Dokumente und Einstellungen\ All   Users\ Anwendungsdaten\ Microsoft\ Network\ Connections\ Pbk\
( in English probably: c:\ Documents and settings\...\ Application data\...)

I would be so grateful if someone could help me out. It is getting on my nerves for quite a long time by now!

Thanks for all replies,
Martin