mysql卸载
数据库有时候出了错误，没法使用，重新安装老失败，原因是卸载数据库不干净导致。
本篇教程我看着不错，就转载了，希望可以帮到大家的忙。
本教程教大家完全彻底手动卸载MySQL 2005数据库，当然其他数据库卸载方法也可用此法。
当数据库因某些未知的错误而能删除的时候，可以使用手动删除的方式来彻底删除已安装的数据库。
1、进入服务管理，停止SQL相关的所有数据库。
2、下载Windows Install Clean Up工具卸载SQL 组件
下载地址：http://download.csdn.net/user/dingbin04
3、用Srvlnstw.exe删除所有SQL服务
下载地址：http://download.csdn.net/user/dingbin04
4、清除注册表
首先将 HKEY_CURRENT_USER/Software/Microsoft 下的Microsoft SQL Server文件夹全部删除，
然后再将 HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft 下的Microsoft SQL Native Client ,Microsoft SQL Server , Microsoft SQL Server 2005 Redist 全部删除。
5、删除残留文件
将C盘Program File下的Microsoft SQL Server文件夹删除
6、重启电脑，重新安装MSSQL数据库
原文链接：http://www.cnblogs.com/C-Shark/articles/2014099.html
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