This revised and updated edition contains information on new computer viruses, with descriptions of 74 viruses as reported in the computer press. It updates the information on antiviral software products, and evaluates a total of 39 antivirus software products. It offers detailed commentary on each product and uses the CVIA classification. It looks at what viruses are and what they do; how systems become infected; the consequences of an infection; the symptoms of an attack; how to purge a virus from the computer system; how to recover from an attack; how to guard agains viruses, including developing management policies and procedures to strengthen the data security environment.