A popular alternative that uses similar disk-level virtualization.
Returnil was famous for its technology. Instead of just trying to block viruses like a standard antivirus, it created a "clone" of your operating system in a virtual environment. Returnil System Safe
Returnil paved the way for modern sandboxing, proving that sometimes the best way to stay safe is to just hit "reset." Returnil System Safe - Download Returnil System Safe
Tools like VirtualBox allow for complete OS isolation for risky experimentation. Returnil System Safe