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Microsoft Defender is on

Time to fix

< 1m

What

Microsoft Defender protects your Windows computer from viruses, malware, and other security threats in real time.

How to enable Microsoft Defender Antivirus on Windows 11

  • Open Start and type Windows Security, then select it from the results.
  • Click on Virus & threat protection.
  • If Microsoft Defender Antivirus is turned off, click Turn on.
  • Ensure Real-time protection is enabled under Virus & threat protection settings.
  • Make sure Tamper Protection is enabled to prevent unauthorized changes to security settings.