Is there a program for Windows XP that will roll back the computer on shutdown?

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I am a teacher at a school who’s IT department does NOT allow us to install any software on their precious computers. My textbook teacher’s edition came with software question banks that I would like to use. Is there some way that, aside from uninstalling the exam creation program every time, my shutting down the computer would roll back the laptop so that it never "knew" I had installed and created a test on the computer? Mostly I use my home computer for such things, but I’d like a solution that wouldn’t have the wrath of the IT department come down on my head (you should have seen what resulted from me installing FireFox) at the school.
Thanks.
there is "Deep Freeze" try searching P2P networks, you’ll have exactly the same data when you restart PC, at our university it works, but it’s not a perfect solution, even though we have only drive C frozen, I’m sure you’ll get the hang of it, I hope the program has the same name
I am not aware of anything that would do what you are asking but I would bypass the IT jerks and go above their heads to the upper management of the school and present my case as an improvement to the system and see what happens.