You are infected with the Blaster worm.
This occurred because of the following:
1. You have no firewall installed.
2. You have not been to Windows update and have not installed the patches
that would have prevented this infection.
3. You do not have a properly configured and updated antivirus program
installed on your computer.
Because of your lax (non-existent) security practices, you are a threat
to the rest of the online community. Until you begin to take at least
rudimentary security measures, you will remain a threat, and should not be
allowed access to the internet until you become a "safe" netizen.
Your problem runs much deeper than the worm that has infected your
computer.
You probably have numerous other worms/trojans and viruses that you are
not even aware of.
Do all of us a favor...do a little research and take the responsibility
to secure your computer as we have, and then you can confidently rejoin the
wonderful world of the Internet.
I apologize if this seems a little harsh, but it is meant to be. Just as
in driving a vehicle, you need to be proactive as well as reactive, or you
become a threat to everyone else.
It isn't difficult to secure your machine...
Bobby