An attempt to grant security to a Windows NT predefined group or "Built-in" Windows NT group may return the following error message:
Error 15401: Windows NT user or group 'NT Machine\NT Group' not found.
Check the name again.
To grant access to a built-in local Windows NT group with SQL Server 7.0, use the BUILTIN\GroupName as the group name.
For example, to add the Windows NT predefined group Backup Operators
to SQL Server 7.0, add the following as the Windows NT Group:
Please see Adding a Windows NT User or Group
in the SQL Server Books OnLine for more examples.