Sandboxie

Sandboxie enables you to easily sandbox your browser and other programs, it runs your applications in an isolated abstraction area called a sandbox. Under the supervision of Sandboxie, an application operates normally and at full speed, but can’t effect permanent changes to your computer. Instead, the changes are effected only in the sandbox.

For those too lazy to set up a full on vm image for testing stuff, this is a pretty good alternative.

Benefits of the Isolated Sandbox

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 don’t leak into Windows.

Secure E-mail: Viruses and other malicious software that might be hiding in your email can’t break out of the sandbox and can’t infect your real system.

Windows Stays Lean: Prevent wear-and-tear in Windows by installing software into an isolated sandbox.

Registration is optional but there is a nag screen after 30 days.

[Download]