Issue with installing Apache

[Transdrive]

I have downloaded xampp and am in the process of loading it. The control panel is open and I have clicked apache to start.

This is the error message.
Status change detected: stopped
9:10:24 PM [Apache] Error: Apache shutdown unexpectedly.
9:10:24 PM [Apache] This may be due to a blocked port, missing dependencies,
9:10:24 PM [Apache] improper privileges, a crash, or a shutdown by another method.
9:10:24 PM [Apache] Press the Logs button to view error logs and check
9:10:24 PM [Apache] the Windows Event Viewer for more clues
9:10:24 PM [Apache] If you need more help, copy and post this
9:10:24 PM [Apache] entire log window on the forums

Does anyone know how to correct this?? Thanking you in advance

Cheers