There are two different versions of Flash. One for IE (ActiveX) and the Plugin version for most other web browsers. 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. 4. Start Firefox and test your installation here: https://www.adobe.com/software/flash/about/ * 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]