FIX: You cannot connect to an instance of SQL Server 2005, and an error message is logged in the SQL Server error log
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Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise X64 Edition, SQL Server 2005 Enterprise Edition & SQL Server 2005 Standard Edition
Notification Contents: New and All Modifications
FIX: You cannot connect to an instance of SQL Server 2005, and an error message is logged in the SQL Server error log
http://support.microsoft.com/kb/941689/en-US