Shadowsurfer is being offered for free from http://www.shadowstor.com/download.html
Just enter in the code SURFER and put in some false information for the address, and a real e-mail address. Then select the phone me for billing, and you will be sent a free lisence
I thought the mods of this forum may like it for doing virtual pcs for the training, since you can do scans very quickly, unlike a true virtual pc.
THe program is also nice for testing out software or traveling to the dangerous parts of the internet, or wanting to play a game with malware in it(don't recomend bad surfing habits by the way).
When the pc is rebooted, everything is restored to the perfect shape it was in. Pretty sweet eh?