not able to start Apache on my pc

[pas]

Error: Apache shutdown unexpectedly.
22:49:57 [Apache] This may be due to a blocked port, missing dependencies,
22:49:57 [Apache] improper privileges, a crash, or a shutdown by another method.
22:49:57 [Apache] Press the Logs button to view error logs and check
22:49:57 [Apache] the Windows Event Viewer for more clues
22:49:57 [Apache] If you need more help, copy and post this
22:49:57 [Apache] entire log window on the forums