Don't use AV software at all. Nowdays we can't trust to AV software vendors (what do they do with your personal data?). Finally, AV very often treat good software (but packed by some packer like boxedapp, or turbo, or vmprotect) as malware and at the same time threats real malware as good software! My opinion is that AV industry exists only because of aggressive marketing. No more. Wash your hands with water, don't install strange software from strange websites, keep your Windows fresh. And you will not need AV. Dixi!