/* Go to the phpMyAdmin panel and select the SQL tab.
** Then run this lines:
*/
UPDATE mysql.user SET Password=PASSWORD('new_password') WHERE User='root';
FLUSH PRIVILEGES;

/* Open the file C:\xampp\phpMyAdmin\config.inc.php
** Search for this line and set the new password.
*/
$cfg\['Servers'\]\[$i\]['password'] = 'new_password'