Anti-malware and the anti-virus protection suite Windows Defender now comes pre-installed with the latest, Windows 10. It’s fairly decent in keeping your computer safe from various security threats, though it doesn’t hold up to other free and paid alternatives out there. Windows Defender is also smart enough to disable itself when you install a compatible third-party anti-virus, but Microsoft doesn’t make it easy to turn it off permanently on your own. Disabling Windows Defender can open your computer to threats.
Hit the Windows key and search for Windows Defender Security Centre. Open it. Choose Virus & threat protection on the left-hand side. Click on Virus & threat protection settings on the right-hand side. Under Real-time protection, turn off the toggle marked On.