Well if you have read the google entries, you will see that TrustedInstaller as only user with access to files is supposed to protect "crucial system files". It is not supposed to protect the whole Program Files folder.
If the group 'Administrators' does not have access to that folder it got deleted somehow, as this is not the default behaviour.
Maybe this happens if you upgrade from XP without an admin account to Vista without deleting the file system first. I do not have a system to test this though.
Last edited by Kaldran : 05-15-2009 at 10:15 AM.
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