This is a FREE product that you can add to XP or Vista computer that allows you to lock the computer to a know configuration and you can not change ANYTHTHING or the computer till you go in as a Administrator. This is Freezing the computer in a point in time.
Think of it as the ultimate lock down of a computer for libraries, schools, and public places like hotel or shared computers.
If you setup a computer no matter what they do just reboot and it back to the way it was.
to learn more about