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Norton 360 Deluxe is our top pick for antivirus. It's a very comprehensive security suite with a simple app that offers strong antivirus protection and protection against online threats, as well as a whole boatload of features—parental controls, storage for cloud backups, a password manager, VPN, and PC utilities. We like it for how extensive yet affordable the service is—you'll be hard-pressed to find a comparable rival.

If you're reading this on a Windows machine, you already have it installed. Windows Security is a superb free antivirus option that covers all the basics, including ransomware protection and light parental controls—and it's automatically enabled if no other antivirus software is installed on your PC. Its only downside? You'll must tweak its settings to get the most of it, and also still sign up for other security services like a password manager for well-rounded online protection.

The short answer is maybe, but probably not. Antivirus software scans files and programs to ensure there is no malware or other harmful threat present. The longer the time frame between each scan, the more files the program will need to check. These intensive scans may have some noticeable effect on your computer speed. It's therefore recommended that you schedule your scans to run more frequently and/or at night so as to not impact your computer usage.While antivirus software can affect the speed of your computer, it is most likely not the only factor—or even the most prominent. Other factors