Apache is not running from XAMPP Control Panel ( Error: Apache shutdown unexpectedly. This may be due to a blocked port)

Question

I have installed XAMPP (xampp-win32-1.8.2-0-VC9-installer.exe) on Windows 7 successfully. But unfortunately, the following error was found during running Apache from XAMPP C

Answer 1

Go in xampp/apache/conf/httpd.conf and open it. Then just chang 2 lines

Listen 80
to
Listen 81

And

ServerName localhost:80
to
ServerName localhost:81

Then start using admin privileges.