After you apply the following Microsoft XML Core Services (MSXML) 6.0 update on a computer that is running Windows XP, you upgrade the computer to Windows XP Service Pack 3 (SP3):
MS08-069: Description of the security update for XML Core Services 6.0: November 11, 2008
When you try to install Microsoft SQL Server 2005 in this scenario, you receive the following error message:
Additional error information
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.
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When SQL Server Setup tries to install MSXML 6.0 SP2, it detects that the version of MSXML 6.0 that is described in Knowledge Base article 954459 is already installed on the computer. Therefore, the validation process indicates that the current version of MSXML 6.0 should not be replaced. This stops the installation of both MSXML 6.0 and SQL Server 2005.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.