Here is the link to the stand alone prevention tool that will block it from running at the root level an changing your files...it's a must if you're running Windows. Typical antivirus proggys are not a sure bet on keeping it from your system as the virus is being changed constantly and the virus definitions and your update clients aren't always hand in hand with the change. I run a PC business and trust me, you don't want this on your system.
http://www.foolishit.com/vb6-projects/cryptoprevent/