Sorry if I seemed to misunderstand but I had to clarify matters because your request did seem a little odd. Have a look in Control Panel>Administrative Tools>Local Security Policy. Select a category then choose which entry from the left-hand pane that you want to change and double click on the current setting in the right-hand pane to see the list of choices you can make.
You will want to be logged in as Administrator to do this effectively, otherwise you will exclude yourself along with everyone else. Make sure the Administrator accounts has a strong password - not something your staff can guess at - mix letters with numbers and use some capitals. A strong password would be in what we call Camel - the hump is in the middle of the word - so you might choose A123toFFee456X or similar.