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

I think Gibson is great. He is Microsofts Devils Advocate.

having someone try to make computing more secure is good.