相信大家使用MySQL都有过重装的经历，要是重装MySQL基本都是在最后一步通不过，除非重装操作系统，究其原因就是系统里的注册表没有删除干净。下面是我总结的一点经验，都是血的教训：
1、在“运行”里键入regedit进入注册表。
2、HEKY_LOCAL_MACHINE/SOFTWARE/MYSQL目录删除
3、HKEY_LOCAL_MACHINE/SYSTEM/ControlSet001/Services/Eventlog/Application/MySQL 目录删除
4、HKEY_LOCAL_MACHINE/SYSTEM/ControlSet002/Services/Eventlog/Application/MySQL 目录删除
5、HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Eventlog/Application/MySQL目录删除注册表中的ControlSet001,ControlSet002,不一定是001和002,可能是ControlSet005、006之类,删除的时候,都删除就可以
6、删除C:/Documents and Settings/All Users/Application Data/下的MySQL文件夹
7、最后卸载MySQL。
8、删除MySQL安装路径下的文件夹。
9、最好重启下电脑。
OK!了(烈火网提示：目前以上方法在MySQL版本是MySQL 5.0的情况下可以重装成功，其它版本需要大家验证了)
(当然Windows7下卸载了MySQL后似乎没有了以上的几个注册表项，所以在Windows7下可以正常的重装)
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