What you're seeing is something that may have come in via MS Messenger (NOT MSN Messenger!)
What virus protection are you using ... Norton or McAfee?
Researching... not finding much yet, but all the reports so far seem to be somehow connected with Norton.
This is the home PC.
I use Hauri ViRobot and The Shield firewall. Just had to reboot Comcast 'cause we got kicked off (took several tries). Wife still can't get a wireless connection.
It's telling her the wireless is now firewalled.