1) Your "Temporary Internet Settings" are too low.

In IE, go to "Internet Options" take a look at your "Temporary
internet files" then click on 'settings' and make sure it's
set at 20,000 MB or higher (I have mine set at 32,000 MB).

2) You don't have Flash 8 installed.

You need Flash 8 installed - go here to get it (free):

http://www.macromedia.com/shockwave/download/download.cgi?P1_Prod_Version=ShockwaveFlash