Port 443 in use... Apache WILL NOT START...

If you've ever encountered this error while using XAMPP, it usually means that port 443, which is the default port Apache uses, has been reserved for use by other applications. Typical applications include Skype and VMWare. To get around this issue, change the port apache listens to - for example, instead of 443 make it 4433:

1. Click the Config button on the XAMPP Control Panel
2. Click Apache (httpd-ssl.conf) 
   
3. By default, in Windows systems, httpd-ssl.conf will open in Notepad. Search for 443 and change it ta a value of your choice.