For Windows 2000 and XP
* Go to start and click Run
* Type services.msc
* Double-click on Messenger.
* In the Messenger Properties window, select Stop, then choose Disable as the Startup Type.
* Click OK.
For Windows 95, 98, and ME
* Under Control Panel, select Add/Remove.
* Select Windows Setup.
* Select System Tools.
* Click Details.
* Uncheck WinPopUp.
* Click OK.