I've already posted a tutorial on how to permanently disable Windows Defender via the Registry, but those who're not comfortable with that, there's an easier method using the "GPE"- Group Policy Editor. Both the Registry & GPE serve the same purpose, but the latter Is very user-friendly and will suit even those with very little experience on the Windows platform. Do note that the GPE Is not available In all editions of Windows 10.
The Group Policy Editor, Is a somewhat hidden feature embedded In the operating system and If you're an average computational user, you'd probably be completely unaware of It's existence. As mentioned, not every Windows 10 edition supports It. Only the Pro, Enterprise and Education editions have It natively Installed.
On the assumption that your Windows 10 OS supports It, I will now show you how to permanently disable Windows Defender. If you change your mind later on, you can re-enable It just as easy. So let's begin.
Open the Run Menu, type "gpedit.msc" (no quotes) and hit OK.
The Group Policy Editor window will now open, so navigate to the following directory:
Computer Configuration > Administrative Templates > Windows Components > Windows Defender.
On the right pane, you will see "Turn off Windows Defender", so double-click It.
On the left hand side, click the "Enabled" radio button and for the change to take effect, press OK.
Now try launching Windows Defender as you normally would, and you'll see the message below. Until you reverse the process (by selecting the "Not Configured" or "Disabled" button), It's now permanently disabled.
Using the Group Policy Editor, Is a lot easier and safer than disabling via the Windows Registry. But the question Is, why disable It permanently to begin with? Well, Windows Defender does have a good reputation for detecting false positives, namely pertaining to hack tools, so If you're like myself and work with tools of that nature, this guide will certainly serve your needs.