Your IP Address is supposed to change, generally.
In any case, I suspect that you simply need to uninstall your AOL software and reinstall it
...and follow the directions for setting up your connection.
See data on Static IP Address and Dynamic IP Address at http://www.whatismyip.com/faq/what-is-an-ip-address.asp
If you are running AOL software, then AOL is the authority on properly setting up Internet connectivity.
In XP...to see my IP address...I just place the cursor on my connection and then look in the lower left window.