1. A method for configuring control rules for applications executable on a computer, the method comprising: classifying, by the hardware processor, at least one computer application into one of a plurality of classification groups that include a trusted classification group, a malicious classification group, and an unknown classification group; configuring, by the hardware processor, at least one control rule when the at least one application is classified in the unknown classification group by: determining, a computer competency score for a user of the computer, wherein the computer competency score comprises a numerical evaluation indicating a level of computer competence of the user; categorizing, based on system library application programming interface (API) functions used by the at least one application, the at least one application into a plurality of categories, wherein at least one category indicates an access capability of the at least one application; calculating, a criticality score of the at least one application as a sum of the criticality scores of the categories in which of the at least one application appears divided by a sum of criticality scores of all predefined categories and multiplied by a correction factor; and generating the at least one control rule for the at least one application that denies use of the application based on a comparison of the determined computer competency score for the user and the calculated criticality score of the at least one application; and blocking execution of the at least one application based on the generated control rule.