Windows Defender is the default antivirus app shipped with Windows 10. Earlier versions of Windows like Windows 8.1, Windows 8, Windows 7 and Vista also had it but it was less efficient previously as it only scanned spyware and adware. In Windows 8 and Windows 10, Defender is based on the Microsoft Security Essentials app which offers better protection by adding full blown protection against all kinds of malware. However, despite Microsoft's claims that it offers full protection, studies have found that third party antivirus apps still offer better protection. If you prefer to use a third party anti malware app, you might want to disable Windows Defender. Here is how you can disable it.
You can use Winaero Tweaker to disable Windows Defender:
You can download it here: Download Winaero Tweaker.
Using Winaero Tweaker, you can keep Defender disabled until you click the option "Enable Windows Defender". I recommend you to disable it this way, it is safe and reliable.
Windows Defender can be temporary turned off via its preferences. To access it, you need to open the user interface of Windows Defender. To open it quickly, press Win + R on the keyboard (see the ultimate list of Win key shortcuts) and type the following in the Run box:
Run it and click on the Settings button.
Toggle the "Real-time protection" option to Off. This will disable Windows Defender in Windows 10.
After some time, it will re-enable itself. So, if you want to disable Windows Defender, use Option #1 or Option #3.
You can disable Windows Defender with Group Policy. Import the following registry tweak:
Windows Registry Editor Version 5.00 [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender] "DisableAntiSpyware"=dword:00000001 [HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows Defender\Real-Time Protection] "DisableBehaviorMonitoring"=dword:00000001 "DisableOnAccessProtection"=dword:00000001 "DisableScanOnRealtimeEnable"=dword:00000001
You need to reboot your PC.
Download ready-to-use registry files from here:
The undo file is included.
That's it. Please leave a comment about which method you tried and which worked for you. Thanks in advance.