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
You need to edit the config.inc file in the phpMyAdmin directory (probably C:\xampp\phpMyAdmin) and change this line to match the password you entered for root in phpMyAdmin.
$cfg['Servers'][$i]['password'] = ' ';