The free way to "snapshot" and roll back Windows 7 systems. Ideal for classroom labs, library public machines, kiosks and any systems used by the clueless or uncaring.
Reboot a system, choose "Roll Back Windows" and walk away for three or four minutes, and when you return, every single system change since you last created a "snapshot" is un-done. With this tool, you can roll back a room full of PCs in minutes.
Download Steadier State http://www.steadierstate.com/