XAMPP, Apache - Error: Apache shutdown unexpectedly

I've just re-installed XAMPP, and when I try to start my Apache server in the XAMPP Control Panel, I now get the following errors:

16:50:25  [Apache]     Status change detected: running
16:50:26  [Apache]     Status change detected: stopped
16:50:26  [Apache]     Error: Apache shutdown unexpectedly.
16:50:26  [Apache]     This may be due to a blocked port, missing dependencies,
16:50:26  [Apache]     improper privileges, a crash, or a shutdown by another method.
16:50:26  [Apache]     Press the Logs button to view error logs and check
16:50:26  [Apache]     the Windows Event Viewer for more clues
16:50:26  [Apache]     If you need more help, copy and post this
16:50:26  [Apache]     entire log window on the forums

How do I solve this?

Answer

Open Skype.

Tools -> Options -> Advanced -> Connection.

Uncheck the "Use port 80 and 443 for alternatives for incoming connections" checkbox

Sign Out and Close all Skype windows. Try restarting your Apache.