Operating system?, browser version you're using?

Just a guess here, but if you don't have Java and Flash installed, please click on the links below and download/install them both:

Download the full "offline" installer, then install the "Java Runtime Environment (JRE) 5.0 Update 10"

http://java.sun.com/javase/downloads/index_jdk5.jsp

Next, install the Flash player from the link below:

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

Next, if you haven't try a different browser, such as Firefox, please click on the link below and download/install it, then try again.

http://www.mozilla.com/en-US/firefox/

Hope this helps.

Grif