If you make the user's "Restricted user's" they can not install programs or mess up your setting's. To set up the start menu's and desktops try this. Start, settings, taskbar & start menu, advanced, and advanced again. You should see folders for each user under documents and settings. each one will have a desktop folder and a start menu folder. You could put what you want from the admin to the "all user's" or copy from admin to each user. If you copy to each user's profile they can delete thing's from their menu without it affecting other user's.
I don't know the same things you don't know.