directory.RemoveAccessRule(new FileSystemAccessRule(  
                //@"system\administrator",  
                FileSystemRights.CreateDirectories | FileSystemRights.CreateFiles | FileSystemRights.Read |  
                FileSystemRights.Modify,  
                InheritanceFlags.ContainerInherit | InheritanceFlags.ObjectInherit,  
                PropagationFlags.None,  
                AccessControlType.Deny)  
                );