Can't shut Virus and threat protections

If you see the message "Your Virus and threat protection is managed by your organization," it typically indicates that the settings are being controlled by a Group Policy or a management tool, such as Microsoft Intune. Since you mentioned that this is a single user machine with no internet access, it is possible that local Group Policy settings are enforcing this behavior.

To change the settings, you can try the following steps:

1. Open the Group Policy Management Console on your machine. You can do this by typing gpedit.msc in the Run dialog (press Win + R to open it).
2. Navigate to Computer Configuration > Administrative Templates > Windows Components > Windows Security > Virus and threat protection.
3. Look for settings that may be enforcing the management of Virus and threat protection. You can modify or disable these settings if they are set to Enabled.
4. After making changes, you may need to restart your computer for the changes to take effect.

If you do not have access to the Group Policy settings or if the settings are not configured locally, you may need to check if there are any third-party security tools installed that could be managing these settings.

If you are still unable to change the settings, you may want to consult with someone who has administrative access to the machine or consider resetting the machine to remove any enforced policies.

References:

• Virus and threat protection