Antivirus software ranks nearly as crucial as a PC’s operating system. No matter how careful you are, some threats can’t be prevented without the additional help of an antivirus program—or a full antivirus suite.

You could visit your favorite website when it’s unintentionally displaying malicious ads. You may accidentally click on a phishing email (it happens!). You could also get caught by a zero-day threat, where an undisclosed bug in Windows, your browser, or an installed program allows hackers to install other malware on your machine.

Sure, PC security software isn’t fool-proof. Antivirus software often can’t do much to stop zero-day exploits, for example. But it can detect when the undisclosed vulnerability is used to install other nasty bits on your machine like ransomware. In general, the average user actively using email, clicking on links, and downloading programs will benefit from an antivirus suite.

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Best antivirus: Keep your Windows PC safe from spyware, Trojans, malware, and more