I DON'T KNOW HOW TO CLOSE YAHOO MESSENGER ... IN ORDER TO UNINSTALL adobe flash player 11 active x
Please check this out: http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html#main_Exit_all_b rowsers_and_other_programs_that_use_Flash.
Hope the above provides you the solution.
See also How to close Internet Explorer and other programs running on Windows?
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