How to Enable Microsoft Defender Periodic Scanning in Windows 11
This guide explains how to manage periodic scanning with Microsoft Defender in Windows 11.
What is Microsoft Defender Periodic Scanning?
Microsoft Defender periodic scanning is a security feature in Windows 11. It allows the built-in antivirus to run occasional checks on your computer. It works even if you have another antivirus program installed.
Why use this? It acts as a safety net. It finds threats that your main antivirus might miss.
What happens when done? Your computer runs light, automated scans in the background. This keeps your system safe without slowing you down.
Prerequisites
Before you begin, ensure you have the following:
- Administrator access to your computer.
- Windows 11 installed and updated.
- A third-party antivirus program installed (if you want to use this as a secondary scanner).
How to Enable or Disable Periodic Scanning
Follow these steps to change your settings. Note: This process requires administrator privileges.
- In the search box on your taskbar, type Windows Security and select Windows Security from the list.
- Click on the Virus & threat protection tile.
- On the next page, look for Microsoft Defender Antivirus options and click it to see more settings.
- Toggle the Periodic scanning switch to On or Off.
Advanced Configuration Methods
Using the Windows Registry Editor
Note: This process requires administrator privileges. You can force this setting using the registry. Be careful when editing these files.
- Press Win + R, type regedit, and press Enter.
- Navigate to: HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender
- Right-click in the right pane, select New > DWORD (32-bit) Value.
- Name it PassiveMode and set the value to 1 to enable it.
Using PowerShell
Note: This process requires administrator privileges.
Set-MpPreference -DisablePeriodicScanning 0
Troubleshooting: Why is the option missing?
If you do not see the option, it is usually because Windows Defender is already your primary antivirus. Periodic scanning is only visible when another security app is registered. If you are in a business environment, your IT department may have disabled this feature via Group Policy.
Summary
Microsoft Defender periodic scanning is a smart way to add a second layer of protection to your Windows 11 PC. By following these steps, you ensure that your system stays secure against hidden malware. Whether you use the Windows Security app, the registry, or PowerShell, you can easily manage your security preferences to fit your needs.
Does Periodic Scanning affect my third-party antivirus performance?
No, it should not. Microsoft Defender is designed to be lightweight. It only runs scans during idle times when your computer is not busy. This ensures that your primary antivirus software continues to work at full speed without any interference or performance drops during your daily tasks.
Can I enable Periodic Scanning via Group Policy for multiple machines?
Yes, administrators can manage this across a network. You can use the Group Policy Object (GPO) editor to set the policy located under Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus. This is ideal for managing security settings across many computers in an office environment.
Was this guide helpful?
I am currently user of Windows 11. Recently, when a Virus scanner linked to Windows 11 Microsoft Defender Antivirus asked me to renew it’s license, I preferred not to do so. So, I decided to uninstalled the virus scanner linked to Windows 11.
Now, my problem is, I could not open the Virus & threat protection settings whenever I want to use the Real-time protection for Quick scan, Full scan, and Customize scan.
What should I do? Please help me.
Thank you.
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