BufferZone!

Sandboxie runs your programs in an isolated space which prevents them from making permanent changes to other programs and data in your computer. Secure Web Browsing: Running your Web browser under the protection of Sandboxie means that all malicious software downloaded by the browser is trapped in the sandbox and can be discarded trivially. Enhanced Privacy: Browsing history, cookies, and cached temporary files collected while Web browsing stay in the sandbox and dont leak into Windows. 16 languages. Secure E-mail: Viruses and other malicious software that might be hiding in your email cant break out of the sandbox and cant infect your real system. Windows Stays Lean: Prevent wear-and-tear in Windows by installing software into an isolated sandbox. »

Cameyo is a free, open-architecture application virtualization product. It combines best-of-breed application virtualization technology with simplicity.