"It's a well-known fact that Viruses have become a serious problem. While not all viruses are malignant, the ones that are can cause plenty of damage. They can attack virtually all operating systems, however they are most common on Windows 9x machines. The plain and simple reason for this is because the people who write these programs do it to cause havoc. The more users of a platform, the more damage they can cause."
FULL STORY @ PCMECH (http://www.pcmech.com/article.htm?virus)