http://get.adobe.com/flashplayer/
Make sure your computer updated with a latest updates and patches from Microsoft and Apple
Make sure the latest version of Sliverlight is installed. It would be under Microsoft updates
If you are running Internet Explorer 8
You need to have the compatibility mode turned off
If you running Internet Explorer 9
You need to have the compatibility mode turned off
Google Chrome
Should work without any setting changes
Firefox
Should work without any setting changes