Too many security programs make using the system inconvenient. The best solution for those who have enough financial resources is to buy antivirus class Internet Security. For those who have financial difficulties, it is better to limit the settings of the system itself (this will help the program to configure the system), free antivirus, browser settings (plug-ins, extensions) and follow the rules of safe surfing the Internet, working with e-mail, etc. d. Also periodically check the system with antivirus scanners.