Windows 10 is great at preventing trojans, ransomware, and other serious issues, but it can fail to stop adware and potentially unwanted programs in its default configuration. Thankfully, the Windows Defender has an adware blocker just for this, and it’s great at stopping unwanted changes to your system or annoying pop-ups. Less fortunately, it can’t be found in an options menu unless you have Windows 10 Enterprise.

So if not through a menu, how do you turn on Defender’s hidden adware blocker? The answer is through registry edits, which many aren’t confident with. Though you can get similar results with third-party software like Malwarebytes, the Windows Defender adware blocker is advanced, completely free, and can have less of a performance impact.

We’re going to show you how to turn the anti-malware feature on without messing up your system. First, however, you should turn on automatic registry backups. This is another feature that’s disabled by default, but it gives you an easy avenue back, should you need it. With that done, let’s get on with the guide.


Enable the Windows Defender Adware Blocker

Press the Windows key and search for “regedit”. Click on “Registry Editor”.

Windows 10 – Search – regedit

Find Computer/HKEY_LOCAL_MACHINE/SOFTWARE/Policies/Microsoft/Windows Defender”, or paste it into the address bar.

Windows 10 – regedit – Windows Defender

Right-click and choose “New > Key”.

regedit – Windows Defender – New Value

In the left panel, create a new subfolder called “MpEngine”.

regedit – Windows Defender – New Value – MpEngine

Right-click once more, but this time select “New > DWORD (32-bit) Value”.

regedit – Windows Defender – MpEngine – New DWORD 32-bit

Name the value “MpEnablePlus”.

regedit – Windows Defender – MpEngine – MpEnablePlus

Set the “Value data” to “1”. Press “OK”.

regedit – Windows Defender – MpEngine – MpEnablePlus – Value data 1

Windows Defender’s anti-adware feature is now enabled. Feel free to restart your PC to ensure the changes have taken effect.