Why can't Apache start?

Question

Apache HTTP Server

I want to start Apache in XAMPP 3.2.1, but it doesn't start, crashes, error code:
15:31:42 [Apache] Error: Apache shutdown unexpectedly.
15:31:42 [Apache] This may be due to a blocked port, missing dependencies,
15:31:42 [Apache] improper privileges, a crash, or a shutdown by another method.
15:31:42 [Apache] Press the Logs button to view error logs and check
15:31:42 [Apache] the Windows Event Viewer for more clues
15:31:42 [Apache] If you need more help, copy and post this
15:31:42 [Apache] entire log window on the forums
MySQL starts up. Help me please.

Answer 1

Check and disable antivirus, skype or other instant messengers. Should help.
PS In short, everything that can occupy port 80

Answer 2

win+R
cmd
netstat -anb | find "LISTENING"

Answer 3

Thank you very much guys, I closed Skype, everything started))

Answer 4

Maybe someone will help.
There was the same problem after upgrading to win 10.
I registered hosts in the httpd-vhosts.conf file.
I did not put one slash and an error came out when starting Apache.