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Table of Contents
Why is it closed by Group Policy?
How to confirm whether it is disabled by Group Policy?
How to restore and enable Windows Defender?
? Method 1: Modify Group Policy (Applicable to Professional Edition and above)
? Method 2: Modify the registry (applicable to all versions)
?? Notes:
What if you don't have permission?
Home Computer Tutorials Troubleshooting Windows Defender is turned off by group policy

Windows Defender is turned off by group policy

Jul 02, 2025 am 10:25 AM
Group Policy

Windows Defender is usually shut down by Group Policy because administrators forcefully disable it through policies, which is often found after enterprise devices or third-party antivirus software is installed. 1. The reasons include unified enterprise management, local testing, or malware tampering; 2. You can confirm whether it is disabled through gpedit.msc or the registry; 3. The recovery method includes modifying the group policy or registry key values; 4. Be careful to require administrator permissions and avoid changing the unit device settings without authorization; 5. If you do not have permission, you can contact the IT administrator or change the usage environment.

Windows Defender is turned off by group policy

If you find that Windows Defender is turned off and prompts "closed by Group Policy", it is usually not that you turn it off manually yourself, but that the system forces this feature to be disabled through management policies. This situation is common on computers at a company or school, and may also occur when the system automatically deactivates Windows Defender after you use certain third-party antivirus software.

Windows Defender is turned off by group policy

Why is it closed by Group Policy?

Windows systems allow administrators to uniformly manage device behavior through Group Policy . If a computer is added to the domain (Domain), or a specific policy is set locally, Windows Defender may be turned off. Common reasons include:

Windows Defender is turned off by group policy
  • Using enterprise-level antivirus software (such as Symantec, McAfee, etc.), the IT department will shut down Windows Defender to avoid conflicts.
  • Local administrators proactively disabled it for testing or compatibility issues
  • Some malware tampers with policies (less common)

At this time, you will see a prompt similar to "Virus protection is managed by the organization" in the "Windows Security Center".


How to confirm whether it is disabled by Group Policy?

You can simply check whether it is really controlled by Group Policy:

Windows Defender is turned off by group policy
  1. Press Win R to open the run window, enter gpedit.msc and press Enter (Pro version and above only)
  2. Go to Local Computer Policy → Computer Configuration → Administrative Templates → Windows Components → Microsoft Defender Anti-virus
  3. Check whether there are options on the right that are enabled or “disabled”

If you see the policy "Switch Microsoft Defender Antivirus" is set to "Enabled", it means that it is indeed disabled by the policy.

Tip: Home version users cannot use gpedit.msc, you can try to view the registry path:
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
If the DisableAntiSpyware or DisableAntiVirus key value is 1, it also means it is disabled.


How to restore and enable Windows Defender?

If you have administrator privileges and want to re-enable Windows Defender, you can try the following ways:

? Method 1: Modify Group Policy (Applicable to Professional Edition and above)

  1. Open gpedit.msc
  2. Enter Microsoft Defender Antivirus Settings
  3. Set "Close Microsoft Defender Antivirus" to "Unconfigured" or "Disabled"
  4. Restart the computer or run gpupdate /force update policy

? Method 2: Modify the registry (applicable to all versions)

  1. Open Registry Editor (regedit)
  2. Positioned to:
    HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender
  3. Check if the following key value exists and set to 0:
    • DisableAntiSpyware
    • DisableAntiVirus
  4. Restart the computer or restart the security center service

?? Notes:

  • If you are a company or school computer, it is recommended not to modify the policy without authorization, as it may violate IT regulations
  • It is best to back up the registry before modification to prevent misoperation from causing system abnormalities.
  • If you install a third-party antivirus software, the effect of trying to restore it is more obvious after uninstalling it.

What if you don't have permission?

If you are not an administrator, or this computer belongs to the organization's management device, you may not have permission to change these settings. At this time you can:

  • Contact your IT administrator and ask for assistance to enable it
  • Check if an alternative antivirus solution is available in Windows Security Center
  • If it is just for personal use, consider changing to an unrestricted environment (such as installing a new system by yourself)

Basically that's it. Windows Defender is not a big problem by Group Policy, but if you want it to work again, you need to find the location of the control policy to adjust. As long as it is not hardware or system corruption, most cases can be solved.

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