Error

[win6084]

When i activate the apache server one xampp he show below errow. pls help me.

10:36:07 AM [main] Initializing Control Panel
10:36:07 AM [main] Windows Version: Windows 7 Home Premium SP1 64-bit
10:36:07 AM [main] XAMPP Version: 1.8.3
10:36:07 AM [main] Control Panel Version: 3.2.1 [ Compiled: May 7th 2013 ]
10:36:07 AM [main] You are not running with administrator rights! This will work for
10:36:07 AM [main] most application stuff but whenever you do something with services
10:36:07 AM [main] there will be a security dialogue or things will break! So think
10:36:07 AM [main] about running this application with administrator rights!
10:36:07 AM [main] XAMPP Installation Directory: "c:\xampp\"
10:36:07 AM [main] Checking for prerequisites
10:36:11 AM [main] All prerequisites found
10:36:11 AM [main] Initializing Modules
10:36:11 AM [Apache] Problem detected!
10:36:11 AM [Apache] Port 80 in use by "Unable to open process" with PID 4!
10:36:11 AM [Apache] Apache WILL NOT start without the configured ports free!
10:36:11 AM [Apache] You need to uninstall/disable/reconfigure the blocking application
10:36:11 AM [Apache] or reconfigure Apache and the Control Panel to listen on a different port
10:36:11 AM [main] Starting Check-Timer
10:36:11 AM [main] Control Panel Ready
10:36:15 AM [Apache] Problem detected!
10:36:15 AM [Apache] Port 80 in use by "Unable to open process" with PID 4!
10:36:15 AM [Apache] Apache WILL NOT start without the configured ports free!
10:36:15 AM [Apache] You need to uninstall/disable/reconfigure the blocking application
10:36:15 AM [Apache] or reconfigure Apache and the Control Panel to listen on a different port
10:36:15 AM [Apache] Attempting to start Apache app...
10:36:16 AM [Apache] Status change detected: running
10:36:21 AM [Apache] Status change detected: stopped
10:36:21 AM [Apache] Error: Apache shutdown unexpectedly.
10:36:21 AM [Apache] This may be due to a blocked port, missing dependencies,
10:36:21 AM [Apache] improper privileges, a crash, or a shutdown by another method.
10:36:21 AM [Apache] Press the Logs button to view error logs and check
10:36:21 AM [Apache] the Windows Event Viewer for more clues
10:36:21 AM [Apache] If you need more help, copy and post this
10:36:21 AM [Apache] entire log window on the forums