Security Policy Errors

How to Fix Windows Real-Time Protection Will Not Turn On

Maira Mehtab Sep 28, 2026 869 views

Question details

The user is unable to enable real-time protection in Windows Security (Microsoft Defender).

Disable Windows Security real-time protection

Product: Windows Security
Device & OS: Windows
Scenario: Attempting to enable real-time protection to secure the operating system against threats.
Observed behavior: Windows real-time protection fails to activate, typically due to interference from third-party antivirus software.

Before you start

Ensure you are logged into Windows with an administrator account, as modifying security software and policies requires administrative privileges.

Solution 1Recommended

Disable or Uninstall Third-Party Antivirus Software

Third-party security software often overrides Microsoft Defender, preventing real-time protection from turning on. Removing or disabling it can resolve the conflict.

When you install another antivirus program, Windows automatically turns off Microsoft Defender's real-time protection to avoid system conflicts and performance issues. If you want to use Windows Security, you must remove other security programs.

Open Windows Settings

Click the Start menu and select 'Settings' (the gear icon), or press Windows Key + I on your keyboard.

Navigate to Installed Apps

Go to 'Apps' and click on 'Installed apps' or 'Apps & features'.

Uninstall Third-Party Antivirus

Scroll through the list to find any third-party antivirus programs (such as McAfee, Norton, or Avast). Click the three dots next to the app and select 'Uninstall'.

Restart Your Computer

Once the uninstallation is complete, restart your computer to ensure all background processes of the third-party software are completely removed.

Enable Real-Time Protection

Open Windows Security, go to 'Virus & threat protection', click 'Manage settings', and toggle 'Real-time protection' to On.

Official Microsoft Guidance: For further troubleshooting, review Microsoft’s Windows Security guidance at support.microsoft.com. Capture any error messages during the process.

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Frequently Asked Questions

Why is my real-time protection switch greyed out?

The switch is usually greyed out because Windows detects an active third-party antivirus program managing your system's security, or because a group policy set by a network administrator is restricting access.

Do I need Windows real-time protection if I have another antivirus?

No, if you have a reputable third-party antivirus actively running and up-to-date, it provides the necessary real-time protection. Windows Defender turns itself off to prevent scanning conflicts.

Can malware prevent real-time protection from turning on?

Yes, some malicious software is designed to disable Windows Security to protect itself. Running an offline scan or using a specialized malware removal tool may be required to clear the infection and restore security functions.

Microsoft Office Security Issues