1.Press the Windows button on your keyboard, or launch the Start Menu using your cursor.
2.Select the "Run..." option.
3.In the prompted box, enter "services.msc".
4.Press the Enter button on your keyboard, or click "OK."
5.Search for "windows Live Messenger" ("Windows Messenger" if you are a Windows XP user) located in the list that will have just appeared, and double-click it.
6.Select "Disabled" from the "Startup Type" menu.
7.Click the "Stop" button.
8.Press the Enter button on your keyboard, or click "OK."
9.Press Alt+F4 on your keyboard, or close the "Services" window using your cursor.