Apache Friends Support Forum

15:47:38 [main] Initializing Control Panel
15:47:38 [main] Windows Version: Windows 7 Ultimate 32-bit
15:47:38 [main] XAMPP Version: 1.8.3
15:47:38 [main] Control Panel Version: 3.2.1 [ Compiled: May 7th 2013 ]
15:47:38 [main] You are not running with administrator rights! This will work for
15:47:38 [main] most application stuff but whenever you do something with services
15:47:38 [main] there will be a security dialogue or things will break! So think
15:47:38 [main] about running this application with administrator rights!
15:47:38 [main] XAMPP Installation Directory: "c:\xampp\"
15:47:38 [main] Checking for prerequisites
15:47:38 [main] All prerequisites found
15:47:38 [main] Initializing Modules
15:47:38 [Apache] Problem detected!
15:47:38 [Apache] Port 80 in use by "Unable to open process" with PID 4!
15:47:38 [Apache] Apache WILL NOT start without the configured ports free!
15:47:38 [Apache] You need to uninstall/disable/reconfigure the blocking application
15:47:38 [Apache] or reconfigure Apache and the Control Panel to listen on a different port
15:47:38 [main] Starting Check-Timer
15:47:38 [main] Control Panel Ready
15:47:45 [Apache] Problem detected!
15:47:45 [Apache] Port 80 in use by "Unable to open process" with PID 4!
15:47:45 [Apache] Apache WILL NOT start without the configured ports free!
15:47:45 [Apache] You need to uninstall/disable/reconfigure the blocking application
15:47:45 [Apache] or reconfigure Apache and the Control Panel to listen on a different port
15:47:45 [Apache] Attempting to start Apache app...
15:47:46 [Apache] Status change detected: running
15:47:47 [Apache] Status change detected: stopped
15:47:47 [Apache] Error: Apache shutdown unexpectedly.
15:47:47 [Apache] This may be due to a blocked port, missing dependencies,
15:47:47 [Apache] improper privileges, a crash, or a shutdown by another method.
15:47:47 [Apache] Press the Logs button to view error logs and check
15:47:47 [Apache] the Windows Event Viewer for more clues
15:47:47 [Apache] If you need more help, copy and post this
15:47:47 [Apache] entire log window on the forums

Enter "Port 80 in use by "Unable to open process" with PID 4!" into Google and follow advice.