[[DDT]ServerAdmin]

Try this:

Click start --> run --> type msconfig and push enter --> select Autostart and uncheck everything. Sometimes it's enough to uncheck all rundll32.dll related, but just to be sure uncheck all. --> click ok and reboot.

Windows will tell you something about an alterativ start or something, just click ok. Install Spearhead, run msconfig again. Select all and click ok. Reboot and everythings fine again.

Just to be sure though, make a backup point or whatever its called, so if anything goes wrong you have a backup. Never had any probs with this though, had to do it on my machine aswell as the server, very strange.
Hope this helps.