Windows NT, 2000, and XP hide an hidden Internet server that is running by default. It receives and accepts, among other things, unsolicited network messages that cause pop-up dialog boxes to appear on the desktop. Internet Spammers have discovered this and are spraying pop-up Spam across the Internet. The Windows Messenger server should never have been running by default, and Microsoft has finally fixed that in Windows 2003, but users of previous Windows need to take responsibility for this themselves.
Simply use the app - Shoot The Messenger
http://grc.com/files/shootthemessenger.exe
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