Problem when starting Apache Server through XAMPP bundle

[m.gial@yahoo.com]

09:18:20 [Apache] Problem detected!
09:18:20 [Apache] Port 80 in use by "Unable to open process" with PID 4!
09:18:20 [Apache] Apache WILL NOT start without the configured ports free!
09:18:20 [Apache] You need to uninstall/disable/reconfigure the blocking application
09:18:20 [Apache] or reconfigure Apache and the Control Panel to listen on a different port
09:18:20 [Apache] Attempting to start Apache app...
09:18:21 [Apache] Status change detected: running
09:18:21 [Apache] Status change detected: stopped
09:18:21 [Apache] Error: Apache shutdown unexpectedly.
09:18:21 [Apache] This may be due to a blocked port, missing dependencies,
09:18:21 [Apache] improper privileges, a crash, or a shutdown by another method.
09:18:21 [Apache] Press the Logs button to view error logs and check
09:18:21 [Apache] the Windows Event Viewer for more clues
09:18:21 [Apache] If you need more help, copy and post this
09:18:21 [Apache] entire log window on the forums

[Nobbie]

See above into "Apache wont start" thread: viewtopic.php?f=16&t=69784

[dabluwt]

09:18:20 [Apache] Problem detected!
09:18:20 [Apache] Port 80 in use by "Unable to open process" with PID 4!
09:18:20 [Apache] Apache WILL NOT start without the configured ports free!
09:18:20 [Apache] You need to uninstall/disable/reconfigure the blocking application
09:18:20 [Apache] or reconfigure Apache and the Control Panel to listen on a different port
09:18:20 [Apache] Attempting to start Apache app...
09:18:21 [Apache] Status change detected: running
09:18:21 [Apache] Status change detected: stopped
09:18:21 [Apache] Error: Apache shutdown unexpectedly.
09:18:21 [Apache] This may be due to a blocked port, missing dependencies,
09:18:21 [Apache] improper privileges, a crash, or a shutdown by another method.
09:18:21 [Apache] Press the Logs button to view error logs and check
09:18:21 [Apache] the Windows Event Viewer for more clues
09:18:21 [Apache] If you need more help, copy and post this
09:18:21 [Apache] entire log window on the forums

Try this:
Go to your Xampp installer folder -> Find Xampp Control Panel Execute file (XamppControlPanel...exe) -> Right Mouse Click -> Run As Administrator.

Cheers...