Linux in the hands of the less-technically-inclined is a double-edged sword. It can be made more bulletproof, and can be made to look and act alot like Windows, but there will still be support issues cropping up.

A good management system that tracks updates and patches is what shields well-run IT shops from this kind of problem. The typical victim of this sort of virus is likely to be someone with an always-on internet connection at home that has out-of-date/no antivirus protection, and/or a propensity for clicking things that should not be clicked.