MySQL安装不上
由于之前安装过MySQL，卸载重装之后，每次到最后一步，start server就无响应，原因在于之前的MySQL没有卸载干净。 卸载步骤： 1,到控制面板里面卸载mysql 2.到安装盘:\Program Files目录下把mysql目录删除 3.如果在其他盘还有设置目录也要删除，空目录也要删
由于之前安装过MySQL，卸载重装之后，每次到最后一步，start server就无响应，原因在于之前的MySQL没有卸载干净。
卸载步骤：
1,到控制面板里面卸载mysql
2.到安装盘:\Program Files目录下把mysql目录删除
3.如果在其他盘还有设置目录也要删除，空目录也要删除
4.到regedit修改注册表，删除：
HKEY_LOCAL_MACHINE/SYSTEM/ControlSet001/Services/Eventlog/Applications/MySQL
HKEY_LOCAL_MACHINE/SYSTEM/ControlSet002/Services/Eventlog/Applications/MySQL
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Services/Eventlog/Applications/MySQL
5.一定要删除目录 C:\Documents and Settings\All Users\Application Data\MySQL
由于目录C:\Documents and Settings\All Users\Application Data\MySQL 是受系统保护目录，所以要先修改用户权限进入该文件夹。
重新安装就安装成功了。
上述内容参考了：mysql安装不上分析
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