How can you put advanced account security on windows 2000?

My mother teaches elementary school and she has three in-class computers for the kids to use for educational purposes. The problem is that the kids mess up the computers by deleting shortcuts, editing settings (pretty much any button or setting they mess with they do.) This makes doing exercises on the computers very difficult because she has to go and manually type in the webaddresses in each computer’s browser and favorites are rarely preserved.

The problem is this: the computers are running Windows 2000 (well one has XP, but I think microsoft has software that will work with that one) and are there only for visiting two or three websites and using like one or two programs I want to set windows so that any changes made to the system are erased when the computer shuts down and I would also like to set windows so that a few shortcut web links on the desktop cannot be deleted as the children like to drag everything into the recycle bin.

I have been relatively unsuccessful finding information online about doing this to windows 2000 (lots of links to microsofts software for XP and up) and I was hoping someone would be able to point me in the right direction of some documentation or something, Any Thoughts?