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.
Pareto checks for other antivirus software as well.