To add to Icon's advice, if you use adobe here the link >>> http://www.macromedia.com/support/documentation/en/flashplayer/help/settings_manager06.html
this will be your actual player, Select delete all websites, also go to your internet tools on your browser, select interent options and select delete browser history.
If this doesnt work if you have registry security do a security check and clear out the registry.
Hope this helps,
Mes.