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You won't find that functionality in Microsoft Defender, though.

However, many users like to schedule an occasional full scan for added security. It's true that after that initial full scan, real-time protection should handle any new attacks. If you feel that you still have a malware problem after a regular scan, give the offline scan a try. That also means it runs before any malware processes load, so in theory, the malware is defenseless. Designed to handle persistent malware that defends itself against removal by a normal scan, this scan reboots the system and runs before Windows fully loads. In addition to the expected Quick, Full, and Custom scan options, Microsoft Defender offers what it calls Offline Scan. A repeat scan finished in less than 15 minutes.

That’s better than the current average of 66 minutes and vastly better than its previous time of almost two hours. In testing, a full scan finished in just under an hour. Where many other antivirus products put a big Scan button front and center, Windows makes you work to even find the on-demand scan choices. Microsoft Defender focuses mainly on real-time protection. I'll go into detail about these features below. Clicking one of those icons (or its corresponding item in the left-rail menu) brings up a page for the selected security features. The main security screen displays large icons for virus protection and six additional feature collections.

When you click the Defender icon in the notification area, it opens the full Security Center. Microsoft Defender differs from other free antivirus tools in that there's no installation required it's already present. Defender does a decent job, too, but the best competitors, including free ones, do even better. By making sure that every Windows installation has protection against malware, Microsoft helps contribute to a kind of herd immunity.

As soon as you install a third-party solution, it goes into suspended animation to avoid conflict. Microsoft Defender turns on to protect systems that have no other antivirus. In Windows 10, Microsoft Defender Antivirus not only protects against all types of malware, but it also manages numerous other security features. Microsoft’s history of providing antivirus protection goes all the way back to DOS, but it’s never seemed to harm the third-party antivirus industry.