Sandboxie-Start unknown programms within a "virtual operating system"

This boring looking tool enables the user to open unknown,suspicius programms within a "virtual OS".This keeps any possible viruses/threats within this "sandbox" and prevent them to spread further to important files or windows system folders.
You also can launch a browser,who is operating within the sandbox out of your kontext menue to surf safely through suspicius websides as well as checking for instance weird email attachments.

Info's and download link:
http://www.sandboxie.com/

The same in German:
http://www.chip.de/downloads/Sandboxie_21760394.html