Either the webserver or IIS isn't running or you don't have qvs installed on the machine.
Use fiddler for to see the communication ( http://www.fiddler2.com/fiddler2/ ).
Should give you the current user.
If you turn on script debugging in IE you do get popup error saying:
Error: 'Qva' is undefined
When you install QVS this should be set up automatically but it's possible that they are pointing to a different website on your server or, as the previous posted suggests, QVS isn't installed at all.