win2008x64位，php5.2转php5.4时安装源码MYSQL出现问题

我百度查了很多，都无法解决问题，求大神给一个容易的解决方法。最好能说一下步骤，拜谢~


数据库连接错误

• mysqlnd cannot connect to MySQL 4.1+ using the old insecure authentication. Please use an administration tool to reset your password with the command SET PASSWORD = PASSWORD('your_existing_password'). This will store a new, and more secure, hash value in mysql.user. If this user is used in other scripts executed by PHP 5.2 or earlier you might need to remove the old-passwords flag from your my.cnf file