Restoring default security settings
In Windows Server 2003 the file Setup security.inf was a security template that represented the default security settings during operating system installation, including the file permissions for the root of the system drive. You could apply portions of this template for disaster recovery purposes, for example to return your file system permissions to their default settings should they accidentally or intentionally have been modified.
In Windows Server 2008 and later however you need to follow a different approach to restore the default security settings of a system. The various options on how you can do this are described in detail in KB 313222:
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Mitch Tulloch is an eleven-time recipient of the Microsoft Most Valuable Professional (MVP) award and a widely recognized expert on Windows Server and cloud computing technologies. Mitch is also Senior Editor of WServerNews. For more information about him see http://www.mtit.com.