We have a KB on this:
915087 Error message when you try to install Windows Defender Beta 2: "Error
1609. An error occurred while applying security settings. User is not a
valid user or group."
http://support.microsoft.com/default.aspx?scid=kb;EN-US;915087
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-steve
Steve Dodson [MSFT]
Windows Defender Beta Lead
MCSE, CISSP
http://blogs.technet.com/stevedod
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harry said:
the installer broke down with the error 1309 could not create folder, user
oder group not valided. The error list is not helpfully. i think the
installer routine has a big mistake.