10:58:28 AM [main] Initializing Control Panel
10:58:28 AM [main] Windows Version: Windows 7 Ultimate 64-bit
10:58:28 AM [main] XAMPP Version: 1.8.3
10:58:28 AM [main] Control Panel Version: 3.2.1 3.1.0 [ Compiled: May 7th 2013 ]
10:58:28 AM [main] You are not running with administrator rights! This will work for
10:58:28 AM [main] most application stuff but whenever you do something with services
10:58:28 AM [main] there will be a security dialogue or things will break! So think
10:58:28 AM [main] about running this application with administrator rights!
10:58:28 AM [main] XAMPP Installation Directory: "c:\xampp\"
10:58:28 AM [main] Checking for prerequisites
10:58:28 AM [main] All prerequisites found
10:58:28 AM [main] Initializing Modules
10:58:28 AM [mysql] XAMPP MySQL is already running on port 3306
10:58:28 AM [main] Starting Check-Timer
10:58:28 AM [main] Control Panel Ready
10:58:32 AM [Apache] Attempting to start Apache app...
10:58:33 AM [Apache] Status change detected: running
10:58:37 AM [Apache] Status change detected: stopped
10:58:37 AM [Apache] Error: Apache shutdown unexpectedly.
10:58:37 AM [Apache] This may be due to a blocked port, missing dependencies,
10:58:37 AM [Apache] improper privileges, a crash, or a shutdown by another method.
10:58:37 AM [Apache] Press the Logs button to view error logs and check
10:58:37 AM [Apache] the Windows Event Viewer for more clues
10:58:37 AM [Apache] If you need more help, copy and post this
10:58:37 AM [Apache] entire log window on the forums

Is there an apache error log? It should have the actual reason for the failure. What you have posted looks like the XAMPP log.