Your Windows computer comes with a built-in antivirus program, but you shouldn't rely on it to keep you totally safe. PCMag's Neil J. Rubenking's article "Think Windows's Built-In Antivirus Will Keep You Safe? You're Wrong" offers some surprising test results. He writes that "Results from independent labs and our own hands-on tests show that you really need a third-party antivirus utility." You can read his full article here.