Anti virus research paper | Computer Science homework help

 The focus of the reseach paper is Host Intrusion Detection Systems (HIDS) or AntiVirus Systems.  Computer Virus creates major headaches for most organizations, as this list of shows. These viruses combined have caused damages into the billions of US Dollars.  How can one protect against virus outbreaks in an organization?  What are the common causes of this problems?  How would use address this troublesome trend?