[URL=http://www.grc.com/]Gibson Research Corporation[/URL], the company offering port scanning and an immense amount of security and privacy information to the end user for free have released a small [URL=http://grc.com/files/DCOMbob.exe](29kb) program[/URL]. Which will verify if your system is vulnerable to the Blaster virus and also allow you to permanently disable the DCOM service. [URL=http://grc.com/dcom/]See their DCOM page[/URL] for more details on the program and the DCOM vulnerability.