Windows: Programs that "freeze" Windows are great for testing new software without risking your system. Each time you reboot, all the changes (including viruses) are erased. ToolWiz is another system restore utility, but this free program adds password protection.
We've covered similar programs like Reboot Restore Rx that prevent changes to your computer. ToolWiz adds a password stops someone from changing the system without your permission.
It's compatible with all versions of Windows. Like other "freezing" programs, it lets you exclude folders from protection so your documents can stay intact, too.