Poti face autentificare mixta si sa stergi grupul BUILTIN\Administrators. Insa inainte de a face asta studiaza problema bine.

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Cristian Andrei Lefter, SQL Server MVP
MCT, MCSA, MCDBA, MCAD, MCSD .NET,
MCTS, MCITP - Database Administrator SQL Server 2005
http://sqlserver.ro