Abstract Computer viruses are known as the five ways for computer crimes in the 21st century and always stand at the second place of the five. The harmfulness of the viruses is theproduction of various destructive programs and its quick pervasion into other fields. Now millions of users are frequently harassed by the viruses and some are extremely frightened. In fact,the harassment comes from the misunderstanding of the viruses. So users of computer
ought to have further clear knowledge and all sided scientific view of viruses.
Keywords Computer viruses, Analyze, Measure.