Unfortunately, despite efforts by our government, large anti-virus companies and extremely large expenditures, viruses continue to plague all computer users.
The methods to prevent virus's from affecting your computers and networks and relatively straight forward - firewalls, anti-virus programs, anti-malware programs, server configurations, etc.
Despite all efforts however, networks still become affected. I will devote this space to present relevant articles related to virus's to help keep you up to date. This space is informational only and can only attempt to be current in (unfortunately) a very dynamic area.