Open Windows Live Messenger window (sign into Messenger if you haven’t do so).
Press Alt key to reveal menu bar, then click on Tools and select Options. It’s also possible to click on Show menu icon after the “Search contacts or the web” box. Alternatively, click on the logged on contact’s name on the top of the Messenger client window, and select Options.
Select General (earlier version of WLM) or Sign In (current latest version of WLM) on the left pane.
Deselect and uncheck the Automatically run Windows Live Messenger when I log on to Windows check box.
Click OK.
Windows Live Messenger will not start itself automatically from next system boot up. User will need to start the program manually from Start Menu.
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