Sandboxie lets you run any program in a way so that it doesn`t interact with your data or settings, for example you could run your browser in sandboxie and any toolbar,malware,adware that gets installed why using it becomes trapped in sandboxie!,of course this make it a great tool for when you like to check something dangerous inside your computer without all the risk involved.
get it at http://www.sandboxie.com/
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