XAMPP Apache will not run error

[NGNERD]

Please help. I saw this exact post with problem solved but I can not understand what they did to solve the problem. Below is my error:
12:13:48 PM [main] Initializing Control Panel
12:13:48 PM [main] Windows Version: Windows 7 Enterprise SP1 64-bit
12:13:48 PM [main] XAMPP Version: 1.8.3
12:13:48 PM [main] Control Panel Version: 3.2.1 [ Compiled: May 7th 2013 ]
12:13:48 PM [main] You are not running with administrator rights! This will work for
12:13:48 PM [main] most application stuff but whenever you do something with services
12:13:48 PM [main] there will be a security dialogue or things will break! So think
12:13:48 PM [main] about running this application with administrator rights!
12:13:48 PM [main] XAMPP Installation Directory: "c:\xampp2\"
12:13:48 PM [main] Checking for prerequisites
12:13:48 PM [main] All prerequisites found
12:13:48 PM [main] Initializing Modules
12:13:48 PM [Apache] Problem detected!
12:13:48 PM [Apache] Port 80 in use by "Unable to open process" with PID 4!
12:13:48 PM [Apache] Apache WILL NOT start without the configured ports free!
12:13:48 PM [Apache] You need to uninstall/disable/reconfigure the blocking application
12:13:48 PM [Apache] or reconfigure Apache and the Control Panel to listen on a different port
12:13:48 PM [mysql] XAMPP MySQL is already running on port 3306
12:13:48 PM [main] Starting Check-Timer
12:13:48 PM [main] Control Panel Ready
12:13:54 PM [Apache] Problem detected!
12:13:54 PM [Apache] Port 80 in use by "Unable to open process" with PID 4!
12:13:54 PM [Apache] Apache WILL NOT start without the configured ports free!
12:13:54 PM [Apache] You need to uninstall/disable/reconfigure the blocking application
12:13:54 PM [Apache] or reconfigure Apache and the Control Panel to listen on a different port
12:13:54 PM [Apache] Attempting to start Apache app...
12:13:55 PM [Apache] Status change detected: running
12:13:55 PM [Apache] Status change detected: stopped
12:13:55 PM [Apache] Error: Apache shutdown unexpectedly.
12:13:55 PM [Apache] This may be due to a blocked port, missing dependencies,
12:13:55 PM [Apache] improper privileges, a crash, or a shutdown by another method.
12:13:55 PM [Apache] Press the Logs button to view error logs and check
12:13:55 PM [Apache] the Windows Event Viewer for more clues
12:13:55 PM [Apache] If you need more help, copy and post this
12:13:55 PM [Apache] entire log window on the forums
12:14:37 PM [main] Executing "services.msc"
12:16:28 PM [main] Executing "c:\xampp2\"
12:31:12 PM [Apache] Problem detected!
12:31:12 PM [Apache] Port 80 in use by "Unable to open process" with PID 4!
12:31:12 PM [Apache] Apache WILL NOT start without the configured ports free!
12:31:12 PM [Apache] You need to uninstall/disable/reconfigure the blocking application
12:31:12 PM [Apache] or reconfigure Apache and the Control Panel to listen on a different port
12:31:12 PM [Apache] Attempting to start Apache app...
12:31:12 PM [Apache] Status change detected: running
12:31:13 PM [Apache] Status change detected: stopped
12:31:13 PM [Apache] Error: Apache shutdown unexpectedly.
12:31:13 PM [Apache] This may be due to a blocked port, missing dependencies,
12:31:13 PM [Apache] improper privileges, a crash, or a shutdown by another method.
12:31:13 PM [Apache] Press the Logs button to view error logs and check
12:31:13 PM [Apache] the Windows Event Viewer for more clues
12:31:13 PM [Apache] If you need more help, copy and post this
12:31:13 PM [Apache] entire log window on the forums

[Nobbie]

http://lmgtfy.com/?q=Port+80+in+use+by+ ... with+PID+4!

[NGNERD]

That worked. Thank you !!!