Hello I am using Windows 7 ultimate x86_64 What are different types of groups like User, SYSTEM, authenticated users ? Who belong to those groups? I don't want any users should access certain drives and folders. Only administrator should have full control. What i did is security->advanced->change permissions- removed Users group. Then to administrator also, delete permissions are denied. Can I create a group where all users (excluding superuser) will belong to that group and permissions are applied to that group only. Please help in this matter. thanks in advance.