Heeeeeey...sounds like the virus that affected all the University of Hawaii computers with XP today! Grr...

This is the release from the UH ITS department with instructions on how to fix it:

There are reports from people on campus that they cannot use Windows Update, their computer is shutting down on its own, or they are unable to update or use their antivirus software. These are symptoms of the W32/Lovsan or Blaster worm. The worm spreads through insecure shared folders (the worm uses port 135 TCP). This worm is using a Microsoft vulnerability called DCOM RPC from the security bulletin http://www.microsoft.com/technet/tre.../MS03-026.asp. It is very important that you install this patch installed immediately and update your antivirus software to the most current version 4283 dated August 6th. There is a special Extra DAT file for McAfee VirusScan extrablaster.exe*** to help you detect and clean this worm.
More information will be posted when available.