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Uninstalling SQL Server 2005 Standard on Windows Server 2003 Fails With Fatal Error

Posted on 2011-02-11
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Last Modified: 2012-05-11
I've got a Windows Server 2003 that originally had just SQL Server 2005 standard edition on it. Later I installed SQL Server 2008 standard edition on it as well. I am now trying to uninstall SQL Server 2005 and the uninstall is terminating with a fatal error. This server also runs Active Directory. Can't remember if I promoted it after the initial SQL Server 2005 or before. The specific error message: "The setup has encountered an unexpected error while Setting Internal Properties. The error is : Fatal error during installation." I came across this kb article, but my registry does not have the exact keys they specify so I could not do anything with it:
http://support.microsoft.com/kb/919945

Thanks for any help.
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Question by:tcianflone
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by:robertg34
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You might want to check these registry keys as well:
http://support.microsoft.com/kb/925976
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by:tcianflone
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Question not abandoned. Haven't had time to get back to this, buy I intend to and then post my results here. Thanks.
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Well, this was quite an adventure. Turns out that kb article referenced by robertg34 helped to explain the one I referenced in the question, which ultimately led to the fix. kb919945 references this registry key: [HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Microsoft SQL Server\MSSQL.X but it doesn't tell you the 'X' is a placeholder for the version of SQL you're running. That I learned from the kb article posted by robertg34. Once I learned that and started looking at the registry again, I saw that SQL Server 2005 had both an SQL name (MSSQL.1) and an OLAP name (MSSQL.2). Found this in the InstanceNames key of the registry. Under MSSQL.1 I deleted the key data (NOT the keys themselves) suggested in kb919945. This got me to the point that the 2005 database server would uninstall, but the analytical services still failed to uninstall. Under MSSQL.2 I found one more group key not mentioned in kb919945: ASGroup. This also had a security identifier loaded, so I deleted that data, just like I did the in the keys under MSSQL.1, and then that part of the uninstall completed successfully.
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by:tcianflone
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I'm awarding robertg34 since he's the only one to offer any clarifying material.
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