Account Security Problems

How to Add a Reset Windows 10 PC to Microsoft Defender

Ayan Masood Oct 22, 2026 868 views

Question details

The user needs to re-add their reset Windows 10 PC to Microsoft Defender because the device is missing from the list.

How to Add a Reset Windows 10 PC to Microsoft Defender

Product: Microsoft Defender
Device & OS: Windows 10
Scenario: The user recently reset their Windows 10 PC and reinstalled the Microsoft Defender app from the Microsoft Store.
Observed behavior: The reset computer no longer appears in Microsoft Defender, and the Add Device dialog does not list the PC.

Before you start

Ensure you are logged into your Windows 10 PC with an administrator account, as modifying the Local Group Policy requires admin privileges.

Solution 1Recommended

Enable Microsoft Defender via Local Group Policy Editor

Use the Local Group Policy Editor to ensure the Microsoft Defender Antivirus policy is not set to disabled, which often prevents the app from recognizing the device.

After a system reset or certain updates, Windows might inadvertently disable the Microsoft Defender service through internal policy settings. Reverting this policy to 'Not configured' or 'Disabled' will allow the service to run properly.

Open Local Group Policy Editor

Press the Windows key + R on your keyboard to open the Run dialog box. Type 'gpedit.msc' and press Enter.

Navigate to Microsoft Defender Settings

In the left sidebar, navigate to Computer Configuration > Administrative Templates > Windows Components > Microsoft Defender Antivirus.

Modify the Antivirus Policy

In the right pane, locate the policy named 'Turn off Microsoft Defender Antivirus'. Double-click it to open the configuration window.

Apply New Configuration

Select the 'Disabled' or 'Not configured' radio button. Click 'Apply' and then 'OK' to save your changes.

Restart Your PC

Restart your computer. Once rebooted, open Microsoft Defender to verify that your PC is now listed and protected.

Enable Microsoft Defender via Local Group Policy Editor

Policy Updated Successfully: Your Windows 10 PC should now be communicating properly with the Microsoft Defender app. If it still doesn't appear, ensure your Windows OS is fully updated.

Free Microsoft Office alternative

Equip Your Reset PC with WPS Office

After securing your newly reset Windows 10 PC with Microsoft Defender, you will need a reliable productivity suite. WPS Office is a completely free, lightweight, and highly compatible alternative to Microsoft Office, letting you create and edit documents without expensive subscriptions.

1. Download the Installer: Visit the official WPS Office website and click the free download button for Windows.
2. Run the Setup: Open the downloaded executable file and follow the quick on-screen instructions to install.
3. Start Creating: Launch WPS Office and immediately start opening or creating your Word, Excel, and PowerPoint files.

Fully compatible with Microsoft Office formats including DOCX, XLSX, and PPTX.Extremely lightweight, ensuring your freshly reset Windows 10 PC runs smoothly.All-in-one suite featuring Writer, Spreadsheet, Presentation, and PDF tools in a single app.

microsoft office alternative - wps office

Frequently Asked Questions

Why is Microsoft Defender disabled after I reset my Windows 10 PC?

When Windows 10 is reset, lingering registry keys or policies from previously installed third-party antivirus software might remain, causing Windows to believe another antivirus is active and thus keeping Microsoft Defender disabled.

What if I am using Windows 10 Home and don't have the Group Policy Editor?

Windows 10 Home users can achieve the same result using the Registry Editor. Open 'regedit', navigate to HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender, and delete the 'DisableAntiSpyware' key if it exists, then restart.

Does reinstalling the app from the Microsoft Store fix the issue?

Not always. The Microsoft Store app acts as a dashboard. If the underlying Windows service is disabled via Group Policy, the dashboard app will still fail to detect and list your device until the policy is corrected.

Microsoft Office Security Issues