Do you want to "make fun" of the system? Or are not sure that the installation program will take place svezheskachannoy painlessly? Or, perhaps, we decided to go to a dangerous place for the health of the computer on the Internet? You "cover up" at the time of Deep Freeze, providing an impenetrable protection against Trojans, viruses, destructive action, unstable applications, "raw" driver, and curve hands inept actions of the user.
The principle is simple: the program does "cast" system at a certain point, after which you can do with it (System) anything, without fear of the consequences, because after a reboot everything returns to its original state. Immediately loom and application prospects: free access to computers, game rooms, Internet cafes, golf experimentation, testing new drivers and imperfect programs for children and blonde computer. The downside is the price of 45 US money, but there are fatty pluses: access to three operating systems (Windows, MacOS and Linux).
Note that this Shadow Defender program has already been discussed here, but Deep Freeze has a rich settings, Shadow Defender - a lower price.