2,删除注册表三处:
1)hkey_local_machine\system\controlset001\services\eventlog\application\mysql
2)hkey_local_machine\system\controlset002\services\eventlog\application\mysql
3)hkey_local_machine\system\currentcontrolset\services\eventlog\application\mysql
3,删除mysql安装目录;
4,删除c:\documentsandsettings\allusers\applicationdata\mysql(如果你是默认安装);
(可能会隐藏,显示隐藏文件就行了),没必要重启电脑。偶前几天也遇到过这个问题。