apache shudown unexpectedly

[levinemartin63]

very frustrated exampp had been working changed port
Problem detected!
8:49:13 PM [Apache] Port 80 in use by "Unable to open process" with PID 4!
8:49:13 PM [Apache] Apache WILL NOT start without the configured ports free!
8:49:13 PM [Apache] You need to uninstall/disable/reconfigure the blocking application
8:49:13 PM [Apache] or reconfigure Apache and the Control Panel to listen on a different port
8:49:13 PM [Apache] Attempting to start Apache app...
8:49:13 PM [Apache] Status change detected: running
8:49:15 PM [Apache] Status change detected: stopped
8:49:15 PM [Apache] Error: Apache shutdown unexpectedly.
8:49:15 PM [Apache] This may be due to a blocked port, missing dependencies,
8:49:15 PM [Apache] improper privileges, a crash, or a shutdown by another method.
8:49:15 PM [Apache] Press the Logs button to view error logs and check
8:49:15 PM [Apache] the Windows Event Viewer for more clues
8:49:15 PM [Apache] If you need more help, copy and post this
8:49:15 PM [Apache] entire log window on the forums