Properties

Name: BUILTIN\Administrators 
Friendly Name: English 
System:  
Default Database: master 
Deny Windows Security Authenticated Connections:  
Type: Windows security group 
Permissions to Access the Server:  

Roles with this Login

Role
  sysadmin 

SQL

if not exists (select * from master.dbo.syslogins where loginname = N'BUILTIN\Administrators')
    exec sp_grantlogin N'BUILTIN\Administrators'
    exec sp_defaultdb N'BUILTIN\Administrators', N'master'
    exec sp_defaultlanguage N'BUILTIN\Administrators', N'us_english'
GO

See Also

Server overview
Logins list