[Ancient]

Just installed WinXP on my laptop (clean install, no other OS). Having a
problem with one little thing. First, here's what the machine does OK, and
what I need it to do:

1) Successful: Got it networked through a router to my office desktop
machine. Able to see laptop C-drive in its entirety on my desktop, and vice
versa. Only two machines connected this way, and that's all there will ever
be.

2) Successful: Laptop has web access via the router.

3) Laptop will occasionally be used by 2 other people at home, so I have 3
profiles: Mine (admin), and 2 others (not admin).

4) Desktop is part of a VPN setup to my remote company HQ, and laptop may
end up this way, too. This info's provided as background, in case it's
relevant to the next thing, below.

The two other home users are the type that tech support people dread, or
want to shoot. They flail with the mouse and delete things without knowing why. They see error messages and dismiss them before writing them down. I thought XP would provide the ability to keep these users from messing the the entire C-drive, while still allowing them to mess up just what's in their My Documents/My Pictures, etc folders.

But, if I log into their profiles, I find that they can hide/unhide/destroy the entire C-drive contents (via My Computer). How do I deal with this? I
don't want them to be able to see, touch, smell or fondle anything but their own folders.

One last thing: The desktop uses the same workgroup name as the machines I access at my headquarters through the VPN. I used the same workgroup name for the laptop because I assumed it had to be this way in order to access the desktop. And, there's no domain assigned (yet).

So, how do I limit the users on this laptop?

Someone in a winxp newsgroup suggested looking at the group policy editor (gpedit.msc), at the "users and groups" section, but I don't see that when I start the utility.
Help!