A list of installed antivirus or antispyware programs is displayed.Click the View installed antivirus apps or View installed antispyware apps option.In the Security and Maintenance window, click the Security option to expand that section.If a link is not available in the pop-up message, you need to open the Control Panel and access the Security and Maintenance option.Microsoft Defender Antivirus is now enabled. If available, click the click here to turn it on link in that pop-up message. You should see a pop-up message stating the program is turned off.On the Options screen, in the left navigation pane, click Administrator.On the Tools and Settings screen, click Options.Click the Tools option in the top menu.Microsoft Defender Antivirus is enabled by default, so there is no need to manually enable it unless it was previously disabled. How do I enable or disable Microsoft Defender Antivirus?

If you have another antivirus program installed on your computer, like AVG, McAfee, or Webroot, Microsoft Defender Antivirus is disabled to prevent conflicts with the antivirus program.

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