一、在控制面板中查看是否有mysql，有则进行卸载。或运行相同版本的mysql安装文件，选择“remove”进行卸载。
二、卸载mysql后其服务仍在，解决办法：
点击“开始”-“运行”，输入cmd打开DOS窗口，输入命令“mysqld -remove”或“mysqld -nt -remove”并回车。
三、删除注册表中mysql项：点击“开始”-“运行”，输入“regedit”打开注册表编辑器，
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\Eventlog\Application\MySQL 目录删除
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet001\Services\MySQL 目录删除
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\Eventlog\Application\MySQL 目录删除
HKEY_LOCAL_MACHINE\SYSTEM\ControlSet002\Services\MySQL 目录删除
四、删除硬盘上mysql残留目录：
删除mysql安装目录和包含的所有文件，删除系统用户目录下mysql目录和包含的所有文件，
如“C:\Documents and Settings\All Users\Application Data\MySQL”。最好是全盘搜索“mysql”目录进行删除。
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