Cannot permanently Disable Windows Defender


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Despite writing a DWord in the Registry to disable Windows Defender, its still live.

Reason for disabling Defender is that System Restore cannot restore due to Defenders protection.

Tried installing gpedit.msc as I have the Home edition of windows, but Windows Defender is not listed.

Anyclues
 
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Regedit32

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Turn off Real-time protection.
  • Press Windows key + I together to open Windows Settings
  • Select Update & Security
  • On left pane select Windows Security
  • On right pane select Virus & threat protection
  • In the new window that opens, beneath Virus & threat protection settings click the hyperlinked: Manage settings
  • Toggle off Real-time protection

    With Windows Defender temporarily off, run your System Restore, then when done, return to same location to toggle on Real-time protection, or alternately, simply restart your computer, which should automatically turn on Real-time protection for you.
 

Regedit32

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I was thinking about your post again.

You mentioned you modified your Registry with no positive effect.

Assuming you modified the correct Hive or sub-key, and added the correct REG value, the reason it will not work is because Windows Defender has Tamper protection. To succeed in taking control of Defender using the Registry, you first need to disable the Tamper protection.

Disabling Tamper protection can be done in the Registry, but rather than play there, you can simply scroll down the same screen where you toggle off / on the Real-time protection and a little further down this page, you'll be able to toggle off the Tamper protection. With that turned off, you can then modify the Registry, then restart your computer for its affect to take place.

Note: Disabling Windows Defender in this way leaves you vulnerable to malware infections. So once you've done what it is you need to do with System Restore point, I'd advise removing the modification to Registry and restarting computer to allow Windows Defender to run.
 

Regedit32

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One last though on your original post:

You also mentioned you installed Group Policy Editor onto your Home Edition of Windows 10, but could not find Windows Defender.

First, I'm not sure setting Group Policies with this tool in a Windows 10 Home environment will even work, but assuming it does, then you'll find Windows Defender by expanding in the left pane of your GPO to this location:

Computer Configuration > Administrative Templates > Windows Components > Windows Defender Antivirus

After clicking on Windows Defender Antivirus in the left pane you'll see its contents in the right pane.
  • On the right pane locate and double-left click on Turn off Windows Defender Antivirus
  • Click Enable
  • Click Apply
  • Click OK
  • Close GPO and restart computer

    Note: Before opening the Group Policy Editor to do the above steps, you will first need to go to the Manage settings for Virus & threat protection, and toggle off the Tamper protection, otherwise setting this Group Policy setting will fail.
 
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If you want to do disable Windows Defender, the default antivirus of Microsoft Windows then follow the steps below:

Step 1: First, go to Windows Start and search for Windows Security.
Step 2: Now from there click on Virus & threat protection settings >> Manage settings.
Step 3: In the next window, turn off the toggle switch Real-time protection.
Step 4: Now the antivirus will disable the real-time protection. Now you are able to make specific changes and install the restricted apps that were blocked by the security features.
 

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