BleepingComputer.com: Live Meeting/Office Communicator

I need help with Live Meeting, trying to set up my dial-in conferencing settings. Here's what's happened so far:

*I installed the add-in, because I had no idea if I had it or not. How would I know this? How would I know what it's called?
*Conferencing, User Accounts, under Office Communications Server I entered email address, clicked Advanced, entered domain/username and PW (that I log into the network with)
*Conferencing, User Accounts, under Live Meeting Service, I entered domain/username and PW (same as one above)
*Both returned with "Your Live Meeting Login Information Successfully Verified"
*Click on Conferencing, Dial-In Conferencing Settings, and receive and error - "Dial-In Conferencing Settings Web Page Not Available" (and I did this step before, in between, after - you name it, I tried it!)

This has been going on for weeks. I tried to fix it a few weeks back, but got frustrated and gave up - and actually refused to try until today! My frustration has returned....I can't figure out what's wrong.

I am not a computer guru - not even close! - so please be gentle in your reply! A fix will be GREATLY appreciated! I need to start using the program as it was intended :-)

Have the server settings been changed by any chance? I would discuss this with the person managing the server to be sure all your required settings are correct and that the server and client settings match.