Secure your computer: Enable Advanced File System Security Options

This will further secure your windows explorer and not really a performance tweak.
Open registry by going to START-RUN and entering regedit.
Navigate to [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Lsa] . In this look for value of "forceguest". If available, its default value would be 0. Set its value to 1. This would enables Windows XP logic for advanced permissions.

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