Firstly I am using this on an Asus EEE 701, so I have limited HD capacity and do not save shed loads of anything to it. In the 14 months of ownership I have never experienced any problem whatsoever and surf the net daily with it.
When you use Returnil a virtual drive is created. It is that drive that is then open to all the normal nasties associated with the online experience. On closing down your PC that drive is erased and any/all harmful problems. Your main drive is not open to the internet.
Downside.
If you download a program that you like you have to open up returrnil turn it off and reboot. Then you are now UNSAFE. Then you can re-download program and immidiately turn on returnil (no need for reboot).
Plus side
My laptop always reboots in exactly the same stable state.
It takes a bit of getting used to and I only use it for a laptop which is used mainly to surf the web. The laptop is networked so I need to be thoughtful.
The above is my take on how Retunil works (their website seems unavailable at the moment).
It is a more simplistic version of this
Sandboxie - Sandbox software for application isolation and secure Web browsing
If trying Sanboxie make sure you understand how it works. I found retunil was easier to use, and Sanboxie had a conflict with something (I can't remember what it was, but it was pretty much specific to me)
Certainly look at this
http://www.sandboxie.com/index.php?HelpTopics
This thread may help
http://www.wilderssecurity.com/archi.../t-234938.html
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