Faronics Deep Freeze.

http://www.faronics.com/en/Products/DeepFreeze/DeepFreezeCorporate.aspx
Too much for a desktop?
We use weekly backup images for the 3 main computers and recovering six days worth of data shouldn’t be much of an issue but I’m always looking for a better way to protect ourselves. ‘Freezing’ a snapshot of a clean system looks like a good idea, even if it is setup more for use in an Internet kiosk or computer lab.
It’s my understanding that I can ‘unthaw’ certain areas, like My Documents for instance.
Any thoughts? Alternatives?