1.Download the Flash setup file from here: <br /> [http://fpdownload.adobe.com/get/flashplayer/current/install_flash_player.exe Adobe Flash - Plugin version]. <br /> Save it to your Desktop.<br /> 2. Close Firefox using File > Exit <br /> then check the Task Manager > Processes tab to make sure '''firefox.exe''' is closed, <br /> {XP: Ctrl+Alt+Del, Vista: Shift+Ctrl+ESC = Processes tab} 3. Then run the Flash setup file from your Desktop. * On Vista and Windows 7 you may need to run the plugin installer as Administrator by starting the installer via the right-click context menu if you do not get an UAC prompt to ask for permission to continue (i.e nothing seems to happen). <br /> See this: <br /> [http://vistasupport.mvps.org/run_as_administrator.htm]