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Login failed for user ''.  Not associated with a trusted SQL Server connection

Last Modified: 2012-05-06
I have SQL Server 2005 and Windows Server 2003. Recently I formatted and reinstalled all programs of an user computer of the WorkGroup that  could access the sql server but now when I try to access to the SQL Server from the formatted computer with the same user and password  I get:Login failed for user ''.  Not associated with a trusted SQL Server connection.
I have the Windows Authentication in the SQL Server enabled.

Can anybody help me ?

Thanks in advance.
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