Hi,
So, you are using Jboss 7. The following links will help you change the port number of jboss AS 7
http://shrubbery.mynetgear.net/c/display/W/JBoss+AS+7+Ports
The standalone.xml can be found at <install_dir>\jboss-as-7.0.2.Final\standalone\configuration folder.
Hope this port change should resolve your server start up issues. You might also want to look at the following link, once your server starts up.
https://issues.jboss.org/browse/JBPM-3396
Regards,
Aparna