Microsoft Defender isn't bad, but it's not enough to fully protect your PC. You don't have to pay extra, though—just use one of the top free antivirus apps we've tested.

Looking for a new antivirus? My tried and tested favorites will improve the security of your desktop PC, laptop, and mobile devices.

Windows Security does more than just basic virus protection. It guards against phishing, blocks ransomware, and prevents malicious apps from running. However, these features aren't easy to ...