We have a user that uses remote desktop to access a Windows 2003 server. She is part of the Administrators group, but we would like to prevent her from being able to shut down the server through RDP. In local computer policy settings under "Shut down the system," Administrators is already added. I would like to remove this group and add only "Administrator" to the list, but the option to add or remove users are grayed out and cannot be selected. What is the reason for this and how do I stop this user from shutting the server down?