Users should be educated about viruses and what they can do to prevents them. Describe the symptoms of virus infections to users and give them detailed procedures for dealing with suspected infections. Teach users how to distinguish possible infections from general hardware and software errors. Keep the virus detection software up to date. Unfortunately, several hundred new viruses appear every month.
Most companies update their virus signature files weekly.
They also provide emergency files within a day should a major virus like Melissa suddenly appear. Scan all disks before you use them. This diligence on your part will never be a waste of time. This is especially true if it is the custom at your site to back up to the network. New viruses like Melissa and Popa infect data files.