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http://www.trustware.com/It uses virtualisation technology to create a safe web-surfing environment, in which any attempt to modify the contents of your computer is merely simulated and doesn't actually have any lasting effects. If you inadvertently download a virus, for example, and it attempts to modify the registry or copy itself to your hard disk, the virus will think that those operations have succeeded whereas, in fact, no registry amendments have been made and no files have been created.
BuffzerZone is available as both a free version and also as BufferZone Pro. The "Pro" version has additional features and normally costs $39.95 for a one-year licence. However, until the end of 2010, Trustware is giving away the software for free.