Social engineering and phishing schemes can trick people (you) into clicking on or downloading an infected link or attachment. A device already compromised by malware could get on your network, people can personally place malware on a system, and some malware sits there, dormant, waiting to come to life and attack. However, even the best antivirus isn't 100% foolproof.

It's imperative, especially with Windows, that you have antivirus installed. These programs-from free tools and paid antivirus software up to major security suites-keep tabs on your Windows PC with scans, real-time monitoring, even heuristic analysis of files and processes so that new threats can be identified. It should be drilled into you by now: Use antivirus software.

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