Error starting Apache

[Kr3sti]

Error: Apache shutdown unexpectedly.
12:20:46 MD [Apache] This may be due to a blocked port, missing dependencies,
12:20:46 MD [Apache] improper privileges, a crash, or a shutdown by another method.
12:20:46 MD [Apache] Press the Logs button to view error logs and check
12:20:46 MD [Apache] the Windows Event Viewer for more clues
12:20:46 MD [Apache] If you need more help, copy and post this
12:20:46 MD [Apache] entire log window on the forums
What should I do