Accessing my Firewall Info

O.k, recently i purchased a Microsoft Wireless Network Router, and all the fixings for my 3 computers. My Dad called Microsoft, who helped him set the shit up, and when I came home, i couldn't get on Mirc, or even direct connect on AIM! Later I found out it had a firewall on it, and I would like to know how, or if, I can turn it off.

Open an Internet Explorer window, and type http://192.168.0.100 in the Adress bar. It should open up your router window main page. If it asks for a password, and yours wasn't set up, it would probably Admin//Admin for the name/pass. (That's what was standard on mine).