phpBB : Critical Error

Could not connect to the database PHP Warning: mysql_connect() [function.mysql-connect]: Access denied for user 'root'@'localhost' (using password: YES) in D:\sites\worldhostingcentral.com\forum\db\mysql4.php on line 48 PHP Warning: mysql_error(): supplied argument is not a valid MySQL-Link resource in D:\sites\worldhostingcentral.com\forum\db\mysql4.php on line 330 PHP Warning: mysql_errno(): supplied argument is not a valid MySQL-Link resource in D:\sites\worldhostingcentral.com\forum\db\mysql4.php on line 331