Need help with apache

[deltabird]

Hi i am a newbie. I just installed apache and received the following error. How do I fix?
5:03:11 AM [Apache] Apache WILL NOT start without the configured ports free!
5:03:11 AM [Apache] You need to uninstall/disable/reconfigure the blocking application
5:03:11 AM [Apache] or reconfigure Apache and the Control Panel to listen on a different port
5:03:11 AM [Apache] Attempting to start Apache app...
5:03:11 AM [Apache] Status change detected: running
5:03:11 AM [Apache] Status change detected: stopped
5:03:11 AM [Apache] Error: Apache shutdown unexpectedly.
5:03:11 AM [Apache] This may be due to a blocked port, missing dependencies,
5:03:11 AM [Apache] improper privileges, a crash, or a shutdown by another method.
5:03:11 AM [Apache] Press the Logs button to view error logs and check
5:03:11 AM [Apache] the Windows Event Viewer for more clues
5:03:11 AM [Apache] If you need more help, copy and post this
5:03:11 AM [Apache] entire log window on the forums