apache server is not started

[chenna1207]

After installing the Xampp server..i click on the start button of apache..it is showing some error message in the window

8:37:37 PM [Apache] Error: Apache shutdown unexpectedly.
8:37:37 PM [Apache] This may be due to a blocked port, missing dependencies,
8:37:37 PM [Apache] improper privileges, a crash, or a shutdown by another method.
8:37:37 PM [Apache] Press the Logs button to view error logs and check
8:37:37 PM [Apache] the Windows Event Viewer for more clues
8:37:38 PM [Apache] If you need more help, copy and post this
8:37:38 PM [Apache] entire log window on the forums