Port 80? Or was it some other port?
There might be some other application which might be using the port. You might have to kill that application and start JBoss. See this for more details http://wiki.jboss.org/wiki/DebugBindException
Open a terminal and enter this command
then look for your port (80 in your case) and note that it, if you are looking for a service on a well known it will print them with the name. (such as http).
If you would like to see the addresses and ports in numerical form, add -n to the command line.
The result you are hoping for is to have java.exe listed as the executing program.