install adobe flash from the adobe site. http://get.adobe.com/flashplayer/
if you already have it installed on IE9 but you use a different browser then you will need the plugin.
fire fox, opera, and chrome all use a flash plugin. if you have it installed then its either dissabled or you havent given it permission to run on the web page your trying to view...
in that case find the websits cookie and delete it then restart your browser and you should then be given an option to run the plugin for that site.