Privacy and Security Turn On or Off Tamper Protection for Microsoft Defender Antivirus in Windows 11


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Microsoft Defender Antivirus is an antivirus software that is included in Windows 11 and can help protect your device from viruses, malware, and other threats.

Tamper Protection in Windows Security helps prevent malicious apps from changing important Microsoft Defender Antivirus settings, including real-time protection and cloud-delivered protection. If Tamper Protection is turned on and you're an administrator on your computer, you can still change these settings in the Windows Security app. However, other apps can't change these settings.

Tamper protection essentially locks Microsoft Defender Antivirus to its secure, default values, and prevents your security settings from being changed through apps and methods such as:
  • Configuring settings in Registry Editor on your Windows device
  • Changing settings through PowerShell cmdlets
  • Editing or removing security settings through Group Policy
Tamper Protection doesn't affect how third-party antivirus apps work or how they register with Windows Security.

Tamper Protection is turned on by default. If you turn off Tamper Protection, you will see a yellow warning in the Windows Security app under Virus & threat protection.

See also:

This tutorial will show you how to turn on or off Tamper Protection for Microsoft Defender Antivirus settings in Windows 11.


You must be signed in as an administrator to turn on or off Tamper Protection.

If the Tamper Protection setting is On, you won't be able to turn off the Microsoft Defender Antivirus service by using the DisableAntiSpywaregroup policy key.


If you have a 3rd party antivirus program installed that disabled Microsoft Defender Antivirus, you will need to turn on periodic scanning to be able to turn on or off Tamper Protection for Microsoft Defender Antivirus.




Here's How:

1 Open Windows Security.

2 Click/tap on Virus & threat protection. (see screenshot below)

Windows_Security_Tanper_Protection-1.png

3 Click/tap on the Manage settings link under Virus & threat protection settings. (see screenshot below)

Windows_Security_Tanper_Protection-2.png

4 Turn On (default) or Off Tamper Protection for what you want. (see screenshots below)

The registry key and DWORD value for this setting is located below for reference, but you will not be allowed to manually change it.

HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows Defender\Features

TamperProtection DWORD

0 = Off
5 = On


Windows_Security_Tanper_Protection-3.png
Windows_Security_Tanper_Protection-4.png

5 If prompted by UAC, click/tap on Yes to approve.

6 You can now close Windows Security if you like.


That's it,
Shawn Brink


 

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Brink

Administrator
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Q; if i get another security software, it will disable the windows system, correct?

Installing a 3rd party AV could automatically disable Windows Defender, but it shouldn't affect Windows Security.
 

My Computers

System One System Two

  • OS
    Windows 11 Pro for Workstations
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom self build
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G75 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 980 PRO M.2,
    1TB Samsung 970 EVO Plus M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3 wall mounted
    Cooling
    Corsair Hydro H115i
    Keyboard
    Logitech wireless K800
    Mouse
    Logitech MX Master 3
    Internet Speed
    1 Gbps Download and 35 Mbps Upload
    Browser
    Google Chrome
    Antivirus
    Microsoft Defender and Malwarebytes Premium
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Motorola MB8611 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Galaxy S20 Ultra 5G phone
  • Operating System
    Windows 11 Pro for Workstations
    Computer type
    Laptop
    Manufacturer/Model
    HP Spectre x360 2in1
    CPU
    i7-1065G7 3.9 GHz
    Memory
    16 GB LPDDR4-3200
    Graphics card(s)
    Intel Iris Plus
    Sound Card
    Intel SST
    Monitor(s) Displays
    13.3" 4K UWVA AMOLED multitouch
    Screen Resolution
    3840 x 2160
    Hard Drives
    512 GB PCIe NVMe M.2 SSD
    Browser
    Google Chrome
    Antivirus
    Windows Defender and Malwarebytes Premium

Sven1458

New member
Local time
1:44 PM
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24
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Windows10 pro
hopefully i will not need to disable it, so i will live with this. if i ever install from scratch it should fix itself then
thanks for your help. if you or anyone comes up with a new idea, please post it
 

My Computer

System One

  • OS
    Windows10 pro
    Computer type
    Laptop
    Manufacturer/Model
    Asus
    CPU
    Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz, 2208 mhz 6 co
    Memory
    32 gb
    Screen Resolution
    1920x1080
    Hard Drives
    3.63 tb

Sven1458

New member
Local time
1:44 PM
Posts
24
OS
Windows10 pro
This afternoon i upgraded the computer in the office and it has the same problems the shield does nothing and when i click on anything in windows security i get the same popup that i need an app to open it. what's going on? 2 different computer same problem. btw, i was offered the upgrade and just said yes. i did not download it and installed it. very strange
 

My Computer

System One

  • OS
    Windows10 pro
    Computer type
    Laptop
    Manufacturer/Model
    Asus
    CPU
    Intel(R) Core(TM) i7-8750H CPU @ 2.20GHz, 2208 mhz 6 co
    Memory
    32 gb
    Screen Resolution
    1920x1080
    Hard Drives
    3.63 tb

Brink

Administrator
Staff member
MVP
Thread Starter
Local time
3:44 PM
Posts
5,750
OS
Windows 11 Pro for Workstations
This afternoon i upgraded the computer in the office and it has the same problems the shield does nothing and when i click on anything in windows security i get the same popup that i need an app to open it. what's going on? 2 different computer same problem. btw, i was offered the upgrade and just said yes. i did not download it and installed it. very strange

Sure seems time for a clean install. :(
 

My Computers

System One System Two

  • OS
    Windows 11 Pro for Workstations
    Computer type
    PC/Desktop
    Manufacturer/Model
    Custom self build
    CPU
    Intel i7-8700K 5 GHz
    Motherboard
    ASUS ROG Maximus XI Formula Z390
    Memory
    16 GB (8GBx2) G.SKILL TridentZ DDR4 3200 MHz
    Graphics Card(s)
    ASUS ROG-STRIX-GTX1080TI-O11G-GAMING
    Sound Card
    Integrated Digital Audio (S/PDIF)
    Monitor(s) Displays
    2 x Samsung Odyssey G75 27"
    Screen Resolution
    2560x1440
    Hard Drives
    1TB Samsung 980 PRO M.2,
    1TB Samsung 970 EVO Plus M.2,
    6TB WD Black WD6001FZWX
    8TB WD MyCloudEX2Ultra NAS
    PSU
    Seasonic Prime Titanium 850W
    Case
    Thermaltake Core P3 wall mounted
    Cooling
    Corsair Hydro H115i
    Keyboard
    Logitech wireless K800
    Mouse
    Logitech MX Master 3
    Internet Speed
    1 Gbps Download and 35 Mbps Upload
    Browser
    Google Chrome
    Antivirus
    Microsoft Defender and Malwarebytes Premium
    Other Info
    Logitech Z625 speaker system,
    Logitech BRIO 4K Pro webcam,
    HP Color LaserJet Pro MFP M477fdn,
    Linksys EA9500 router,
    Motorola MB8611 cable modem,
    APC SMART-UPS RT 1000 XL - SURT1000XLI,
    Galaxy S20 Ultra 5G phone
  • Operating System
    Windows 11 Pro for Workstations
    Computer type
    Laptop
    Manufacturer/Model
    HP Spectre x360 2in1
    CPU
    i7-1065G7 3.9 GHz
    Memory
    16 GB LPDDR4-3200
    Graphics card(s)
    Intel Iris Plus
    Sound Card
    Intel SST
    Monitor(s) Displays
    13.3" 4K UWVA AMOLED multitouch
    Screen Resolution
    3840 x 2160
    Hard Drives
    512 GB PCIe NVMe M.2 SSD
    Browser
    Google Chrome
    Antivirus
    Windows Defender and Malwarebytes Premium

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