I installed Xampp (for Windows). I was happily using it with its all features.
Then I wanted to change MySql password. I set a randomly generated password (rCZ4Xnz78
Here is the solution for Windows machine:
When you changed the root passord to let's say admin and now when you access http://localhost/phpmyadmin you see following screen
Open XAMPP_SETUP/phpMyAdmin/config.inc.php file
change config to cookie and add the password.
And again access the
http://localhost/phpmyadmin !!