Could it be that the address that you are talking about is the port address?
Perhaps the port you chose to run tomcat  on is being used by another
program. Usually tomcat runs on port 8080 or 80 unless you specify another
port. If this is it, you should try to find out what other program you have
running on that port and stop it or change it...or just change the port you
chose Tomcat to run on.

Perhaps you have Tomcat running on port 80 and something else like Personal
Web Server (for ASP) running on port 80 as well. Port 80 allows you to run
something in the browser without specifying the port like this -->
http://localhost rather than this --> http://localhost:8080