Disabling the Messenger Service only removes the symptoms of the "illness."
If your system is suffering from Messenger Service popups, the problem is open TCP
and UDP ports. The spammers use the open ports to reach the Messenger Service.
The solution is a firewall to close the ports!
If you don't understand the concept, try the port scan at Steve
Gibson's www.grc.com or the port scan at the Symantec
web site.