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Click the Virus & threat protection tile (or the shield icon on the left menu bar).Open the Windows Defender Security Center by clicking the shield icon in the task bar or searching the start menu for Defender.However, you can fix the problem simply by running an SFC scan. Your system files can get corrupted and that can cause this error to appear. How do I fix a corrupted Windows Defender?Īccording to users, sometimes Windows Defender service won't start because of file corruption. Click on the Restore defaults button and confirm your action by clicking Yes in the confirmation window.Click on the Windows Defender tab and choose the Restore defaults option from the left side panel.Navigate to the Start menu and open the Control Panel.To do that, just follow these steps: Press Windows Key + R and enter gpedit. This can be a problem, but you can fix it simply by changing that group policy. Sometimes Windows Defender won't turn on because it's disabled by your group policy. Next, select Virus & threat protection icon.
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