Memory in response to you, I misunderstood his question....simple enough
Cheyenne to limit what a user can access on the hd after they log in, all you have to do it modify the folder permissions so that they dont have rights to view/edit the contents of that folder. In XP pro right click on the folder goto properties, then the security tab. Click on the user whose permissions you want to change and change them the way you see fit.