1.彻底删除SQL Server：
hkey_local_machine/software/Microsoft/MSSQLServer
hkey_local_machine/software/Microsoft/Microsoft SQL Server
hkey_current_user/software/Microsoft/Microsoft SQL Server
hkey_current_user/software/Microsoft/MSSQLServer
hkey_local_machine/system/currentcontrolset/control/sessionmanager/pendingfileren ameoperations
2.注册表中的相关信息删除：
HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/MSSQLServer
HKEY_LOCAL_MACHINE/System/CurrentControlSet/Services/MSDTC
HKEY_LOCAL_MACHINE/SYSTEM/CurrentControlSet/Control/Session Manager中找到PendingFileRenameOperations项目
HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Windows/CurrentVersion/setup删除ExceptionComponents
3、运行注册表,删除如下项：
HKEY_CURRENT_USER/Software/Microsoft/Microsoft SQL Server
HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/Microsoft SQL Server
HKEY_LOCAL_MACHINE/SOFTWARE/Microsoft/MSSQLServer
