Adding the Administrators group within SQL Server

If you want to add the group Administrators to SQL so that any user of the Administrators Group can use SQL server, the below code, once executed, will perform this for you:

CREATE LOGIN [BUILTIN\Administrators] FROM WINDOWS WITH DEFAULT_DATABASE=[master]
GO
EXEC master..sp_addsrvrolemember @loginame = N'BUILTIN\Administrators', @rolename = N'sysadmin'
GO