phpBB : Critical Error

Could not connect to the database PHP Warning: mysql_connect(): Access denied for user 'root'@'localhost' (using password: YES) in C:\Inetpub\wwwroot\Donking_com\phpBB2\db\mysql4.php on line 48 PHP Warning: mysql_error() expects parameter 1 to be resource, boolean given in C:\Inetpub\wwwroot\Donking_com\phpBB2\db\mysql4.php on line 330 PHP Warning: mysql_errno() expects parameter 1 to be resource, boolean given in C:\Inetpub\wwwroot\Donking_com\phpBB2\db\mysql4.php on line 331