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Source: Microsoft Support
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When installing the SQL Server 2005 Service Pack 3 update from the Windows Update or Microsoft Update web site you may receive the following error:
Error Code 0x2b2f
Installation of MSXML 6 Service Pack 2 (KB954459) failed because a higher version already exists on the machine. To proceed, uninstall the higher version and then run MSXML 6 Service Pack 2 (KB954459) Setup again.
This error occurs when installing SQL Server 2005 Service Pack 3 to a computer that currently has MSXML6 Service Pack 2 installed. The SQL Server 2005 Service Pack 3 installation is attempting to upgrade the existing MSXML6 Service Pack 2 installation.
To resolve the issue, please click the link below to view the article on the Microsoft Web site and follow the steps listed in that article:
968749 SQL Server 2005 setup fails when MSXML Core Services 6.0 Service Pack 2 has already been installed
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