Method of analyzing of antivirus errors when audit provides

In this paper are given mean and types of audit, probabilities of transitions between the functioning states of information of protection tools with discrete work time. Also, in this work are given four types of antivirus errors with possible situations in the performance of means of discrete work time. Performance cases of antivirus software are described in the form of directed Graf. By four types of antivirus errors is calculated average time of operation without breaking, intensity of appearing of error, average time of backup and intensity of backup of error.