Is the server or domain called SQLServer?
Oh, and as the comment says, these need to be run at the command prompt, not in a SQL query window.
-- In a Command Prompt
Net User Manager01 /Add
Net User Manager02 /Add
Net User Staff01 /Add
Net User Staff02 /Add
Net User Staff03 /Add
-- Using the Computer Management console, add a group named Managers and
-- make Manager01 and Manager02 members of the Managers group.
Gail Shaw
Microsoft Certified Master: SQL Server, MVP, M.Sc (Comp Sci)
SQL In The Wild: Discussions on DB performance with occasional diversions into recoverability
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