Try this, from this site: [
www.kidslovepc.com]
* Open DOS console window, go to c:\mysql\bin. //replace with your mysql directory
* Type: mysql -u root, press Enter.
* Under prompt mysql>
SET PASSWORD FOR 'root'@'localhost' = PASSWORD('passwd');
Note, you need put your real password instead of passwd
* After you change the password for root, you need change config.inc.php in c:\inetpub\wwwroot\phpadmin. //again, replace with your phpmyadmin directory
Open config.inc.php in your desired editor, find: $cfg['Servers'][$i]['password'] = '';
insert your password in the above ''. Save your config.inc.php.