Apeche dosn't start

[aongthor@gmail.com]

8:33:39 AM [main] Control Panel Ready
8:33:39 AM [Apache] Autostart active: starting...
8:33:40 AM [Apache] Problem detected!
8:33:40 AM [Apache] Port 80 in use by "Unable to open process" with PID 4!
8:33:40 AM [Apache] Apache WILL NOT start without the configured ports free!
8:33:40 AM [Apache] You need to uninstall/disable/reconfigure the blocking application
8:33:40 AM [Apache] or reconfigure Apache and the Control Panel to listen on a different port
8:33:40 AM [Apache] Attempting to start Apache app...
8:33:40 AM [mysql] Autostart aborted: MySQL is already running