Another User with launch problems

Another User with launch problems

I have same problems as Jeune fi:
 
1. Can't get the meeting to start...just has swirling "starting hour glass" on presenter side and "waiting for the.." on the participant side.

2. Doesn't seem to realize that the app is already installed. Prompted me to install every single time I tried to start a meeting.

 
I am using Windows XP with IE8.
 
Any suggestions?