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Error message when you try to install Windows Defender: "Error 1609. An error occurred while applying security settings. User is not a valid user or group."
Article ID: 915087 - View products that this article applies to.
When you try to install Windows Defender on a computer that is running a non-English language version of Microsoft Windows Server 2003, Microsoft Windows XP, or Microsoft Windows 2000, you may receive the following error message:
An error occurred while applying security settings. User is not a valid user or group. This could be a problem with the package, or a problem connecting to a domain controller on the network.
An updated version of Windows Defender is available. To download the updated version, visit the following Microsoft Web site:
http://www.microsoft.com/athome/security/spyware/software/default.mspxIf you are running Windows Defender on a non-English version of Windows, uninstall the earlier version, and then install the latest version. If you are running an English version of Windows, you do not have to install the updated version.
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.