Trouble starting Navisphere Manager Simulator

I am having some trouble while launching Navisphere web page for Navisphere Manager Simulator

First time I tried to start Navisphere webpage it installed java on my computer.

Now whenever I am trying to Launch Navisphere I am getting "Loading Java Applet Failed.." at the bottom of webpage.

I have checked Add-ons in Java Plug-in 1.4.2_02 and Sun Java console are Enabled in IE.

Please help.