BUG: Error message when you try to install SQL Server 2005 Service Pack 1 or SQL Server 2005 Service Pack 2 from the existing active node: "The product instance <InstanceName> been patched with more recent updates"
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Source: Knowledge Base
Product: Microsoft SQL Server 2005 Enterprise Edition & SQL Server 2005 Standard Edition
Notification Contents: New and Major Modifications
BUG: Error message when you try to install SQL Server 2005 Service Pack 1 or SQL Server 2005 Service Pack 2 from the existing active node: "The product instance <InstanceName> been patched with more recent updates"
http://support.microsoft.com/kb/934749/en-US