win7上SQLyog登入本地mysql提示:1045 access denied for user'root'@'localhost'

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1、打开DOS进入mysql下bin目录：本人：C:\Program Files\MySQL\MySQL Server 5.1\bin
2、停止mysql服务，net stop mysql

3、在C:\Program Files\MySQL\MySQL Server 5.1\bin后面输入：mysqld --defaults-file="C:\Program Files\MySQL\MySQL Server \my.ini" --console --skip-grant-tables

Version: '5.1.33-community-log' socket: '' port: 3306 MySQL Community Server
(GPL)

4.看到这个结果就说明MySQL已经起来了。
再开一个DOS窗口，同样切到mysql bin目录下，
C:\Program Files\MySQL\MySQL Server 5.1\bin>mysql -uroot mysql
Welcome to the MySQL monitor. Commands end with ; or \g.
Your MySQL connection id is 2
Server version: 5.1.33-community-log MySQL Community Server (GPL)

mysql> UPDATE user SET Password=PASSWORD(’newpassword’) where USER=’root’;
mysql> FLUSH PRIVILEGES;
mysql> quit

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