Avg updating virus definitions

—keep tabs on your Windows PC with scans, real-time monitoring, even heuristic analysis of files and processes so new threats can be identified.

Our top pick is the Check Point Zone Alarm Free Firewall, or get the paid Pro version that does even more.

But even the best antivirus isn't 100 percent foolproof.

A device already compromised by malware could get on your network, people can personally place malware on a system, and some malware, a Remote Access Trojan, lays dormant waiting to attack at just the right time.

And no one can protect entirely against social engineering or phishing schemes that trick you into clicking on or downloading an infected link or attachment.

Hell, there are even rogue programs out there that look like antivirus or antispyware, but when you install them, you get infected!

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