http://www.mozilla.com/en-US/plugincheck/ just "checks" plugin version numbers and notifies you which Plugins need to be updated, it doesn't do the actual updates. Since you already know that you need to update Flash via that message in the browser, the PluginCheck page is of no use to you. ''Also, that page was running very slow when I used it earlier today. A massive number of Flash versions were blocked by this particular Adobe update - it may be the biggest update Adobe has ever done in recent history.'' Currently you have two versions of Flash installed - Shockwave Flash 15.0 r0 and Shockwave Flash 11.7 r700 - so you need to get the Flash Uninstaller and run it to remove the multiple versions of Flash you have now. http://helpx.adobe.com/flash-player/kb/uninstall-flash-player-windows.html Then you need to reinstall the latest version of Flash, making sure that you deselect any "extras" that Adobe wants to "jam you with". http://get.adobe.com/flashplayer/