Oh dear again the world of Windoze is under attack from a security hole in the Operating System - effecting versions Windows 2003, 2000 and Windows XP.
Microsoft describes it as a critical vulnerability and to install Security Update MS04-011, then you will be safe from this worm. (Yeh)
You can get the update from here http://www.microsoft.com/technet/security/bulletin/MS04-011.mspx
For my sins I have Windows XP and 2000 running on VPC 6.1.1 so its time to update.