1. A computer-implemented method for classifying users of antivirus software based on user's level of expertise in the field of computer security, the method comprising: receiving from an antivirus software deployed on a user's computer information about security of the user's computer and history of user's usage of the antivirus software; categorizing the received information into a plurality of categories, including at least (i) a number of computer threats detected by the user, (ii) a frequency of malware infections of the user's computer, and (iii) a level of user's proficiency with the antivirus software; selecting one or more condition-action rules for each category of information; applying the selected condition-action rules to the categorized information to determine user's level of expertise in the field of computer security; and classifying the user as one of an expert user or typical user based on the determined user's level of expertise in the field of computer security.