Many versions of what it DeepFreeze.

DeepFreeze (DP) is a specially designed computer program to restore the operation system settings (OS) you if deepfreeze already installed on your computer. (discussion on the web)

DeepFreeze is one of application programs which function to protect a PC from a wide range of possibilities when someone ignorant to your PC. (discussion on the web)

DeepFreeze, by Faronics, is an application suite for Linux, Mac OS X, and Microsoft Windows. DeepFreeze gives administrators the ability to protect the core operating system files and configuration files from an environment without sacrificing usability for (most) end users. (source Wikipedia).

Below I provide the download link and serial number DeepFreeze. Click Image for download