Faronics Corp. also have a couple of proggies out that might help you out a bit. And they are used in schools to protect their own computers. In particular Deep Freeze and Anti-Executable might be a couple of proggies you might want to look into. Good luck. ...griz
That's not a bad idea either - bring the system back to the state it was before installing any applications by simply rebooting the system. I'll have to check into that.