Warning: mysql_connect() [function.mysql-connect]: Access denied for user

Warning: mysql_connect() [function.mysql-connect]: Access denied for user

Warning: mysql_connect() [function.mysql-connect]: Access denied for user 'root'@'localhost' (using password: YES) in E:\PHPnow-1.5.5_1\htdocs\99Pursey\conn\conn.php on line 2
数据库服务器连接错误Access denied for user 'root'@'localhost' (using password: YES)

请教高手,以上错误怎么解决呢

mysql用户名或密码不正确啊
如履薄冰

老大来了,帮帮怎么解决这个问题啊