There is an inheritance in access right groups. Some time you try untick something, but after clicking "Save" button you get tick back. In that case it's better to untick all rights and start access rights configuration from scratch. This module helps to do it.

After clearing:

The only exception is keeping administration rights for current user (i.e. for your user). If you try to do it, access rights "Administration: Settings" and "Humar Resources: Employee" would be still there, while everything else would be removed.