What's even better is that not only are Avast's basic products free, but they are also available for mobile devices as well as for desktops, which makes Avast a particular ideal choice if you have multiple devices you need to check.
While the company is famous for providing free antivirus software, it's worth noting that this now comes bundled with an anti-malware feature that uses behavioral monitoring to spot rogue programs. Avast offers one of the most competent internet protection suites out there.