Permissions problem in windows 7 ultimate

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.

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