Apache - error en el servidor xampp

Tengo el siguiente erro y no he sabido como solucionarlo, mi servidor estaba funcionando bien, hice algunos ajustes a mi equipo y ya no he podido arrancar el servidor, me serviría de mucho su apoyo de ante mano gracias.

Initializing Control Panel
05:45:31 a. m. [main] Windows Version: Home 64-bit
05:45:31 a. m. [main] XAMPP Version: 7.2.2
05:45:31 a. m. [main] Control Panel Version: 3.2.2 [ Compiled: Nov 12th 2015 ]
05:45:31 a. m. [main] You are not running with administrator rights! This will work for
05:45:31 a. m. [main] most application stuff but whenever you do something with services
05:45:31 a. m. [main] there will be a security dialogue or things will break! So think
05:45:31 a. m. [main] about running this application with administrator rights!
05:45:31 a. m. [main] XAMPP Installation Directory: "c:\xampp\"
05:45:31 a. m. [main] Checking for prerequisites
05:45:43 a. m. [main] All prerequisites found
05:45:43 a. m. [main] Initializing Modules
05:45:43 a. m. [Apache] Problem detected!
05:45:43 a. m. [Apache] Port 80 in use by "Unable to open process" with PID 4!
05:45:43 a. m. [Apache] Apache WILL NOT start without the configured ports free!
05:45:43 a. m. [Apache] You need to uninstall/disable/reconfigure the blocking application
05:45:43 a. m. [Apache] or reconfigure Apache and the Control Panel to listen on a different port
05:45:43 a. m. [main] Starting Check-Timer
05:45:43 a. m. [main] Control Panel Ready
05:46:40 a. m. [Apache] Problem detected!
05:46:40 a. m. [Apache] Port 80 in use by "Unable to open process" with PID 4!
05:46:40 a. m. [Apache] Apache WILL NOT start without the configured ports free!
05:46:40 a. m. [Apache] You need to uninstall/disable/reconfigure the blocking application
05:46:40 a. m. [Apache] or reconfigure Apache and the Control Panel to listen on a different port
05:46:40 a. m. [Apache] Attempting to start Apache app...
05:46:41 a. m. [Apache] Status change detected: running
05:46:46 a. m. [Apache] Status change detected: stopped
05:46:46 a. m. [Apache] Error: Apache shutdown unexpectedly.
05:46:46 a. m. [Apache] This may be due to a blocked port, missing dependencies,
05:46:46 a. m. [Apache] improper privileges, a crash, or a shutdown by another method.
05:46:46 a. m. [Apache] Press the Logs button to view error logs and check
05:46:46 a. m. [Apache] the Windows Event Viewer for more clues
05:46:46 a. m. [Apache] If you need more help, copy and post this
05:46:46 a. m. [Apache] entire log window on the forums