lugins (enter it in url) and disable all plugins except Flash.lugins in the address bar. It will take you to a page that says plug-ins. There you will see a list of plugins installed on your computer (shockwave, flash, silverlight, pdf... etc) every item has a blue link that says disable (or enable if it has been disabled.) Click all of them disable except the plugin that says Flash. When you want to use any of these plugins in the future like PDF viewer just go back to aboutlugins and enable the ones you want.