SQL2012安装 SQL Server 数据库引擎服务实例功能 时出错 等待数据库引擎恢复句柄失败，怎么解救

Hi,

1.You need to Uninstall all the previous Installations of SQL Server.You not only need to uninstall them,also you need to delete all the registry values related to SQL server.

2.Navigate to C:\Program Files\Microsoft SQL Server and delete all the files present in the folder.

3.Double click on the SQL Server setup to begin the installation and proceed with the default settings. When you come to Server Configuration Screen, Change the Account Name of Database Engine Service to NT AUTHORITY\NETWORK SERVICE.

4.If, after changing the Account Name to NT AUTHORITY\NETWORK SERVICE, you are getting validation error it means that your previous installation files of SQL Server are not completely removed.Try to change the Instance name of the SQL Server.Also delete all the registry files of previous installations.

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