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As I am working in a corporate environment where developers faces firewall issues, none of the other answers resolved my issue.

As the port is not used by Skype, but by some other internal applications, I followed the below steps to resolve the issue:

Step 1 - From the XAMPP Control Panel, under Apache, click the Config button, and select the Apache (httpd.conf).

Inside the httpd.conf file, somehow I found a line that says:

Listen 80
And change the 80 into any number / port you want. In my scenario I’m using port 8080.

Listen 8080
Still from the httpd.conf file, I found another line that says:

ServerName localhost:80
Change 80 to 8080.

ServerName localhost:8080
Step 2 - From the XAMPP Control Panel, under Apache, click the Config button again, but this time select the Apache (httpd-ssl.conf). Inside the httpd-ssl.conf file, find line that says

Listen 443
And change the 443 into any number / port you want. I’ll using 4433 as the new port number.

Listen 4433
Still from the httpd-ssl.conf file, find another line that says

<VirtualHost _default_:443>

ServerName localhost:443
And change 443 to 4433.

<VirtualHost _default_:4433>

ServerName localhost:4433
Remember to save the httpd.conf and httpd-ssl.conf files after performing some changes. Then restart the Apache service.

Ref: https://stackoverflow.com/questions/18300377/xampp-apache-error-apache-shutdown-unexpectedly