Poate va conectati pe instanta express (2005) si nu pe instanta de SQL Server 2000?
Verificati unde va conectati ruland SELECT @@SERVERNAME, @@VERSION

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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