Nowadays there are a lot of antiviruses, protective tools, and instruments that can enhance a security level of your system. As a rule, they provide scanners, anti-malware module, anti-theft and cloud protection. In addition, complex utilities have a strong browser protective mechanism and real-time shield that defend your PC against instant threats. Usually, powerful features come with a paid antivirus. Free applications can only scan, send to quarantine, and remove infected files. If you want to unlock functionality and get extra options, then you have to upgrade your free antivirus or purchase a premium version.