How to install active desktop for internet café?

I have an internet café, I have 20 computer units in my shop. Ten machines are running Windows Vista and 10 machines are running Windows 7. What I would like to happen is to customize the desktop of all the machines in my shop, so I am thinking of replacing the normal windows desktop icons with an active desktop for internet café. I tried to use file:// protocol but it simply won’t work. I would like to know how I can do this?
