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Now toggle on the C loud-delivered protection and Real-time protection. Under the Virus & threat protection settings, click on the Manage settings option. Type windows security in the Start menu search bar and select the Best Match.įrom there, open Virus & threat protection. So, to get started with turning on Microsoft Defender, follow the steps below: There are indeed situations where you might have to turn off Microsoft Defender, such as when you are looking to optimize your computer's performance or maybe install a third-party antivirus suite.īut on average, it's far better to have your Microsoft Defender enabled. In a previous tutorial I had described the way to enable Windows Defender on your Windows 7, 8 or 10 based computer.But some users reported that when they click the Antivirus Protection Turn ON button in Action Center (in Windows 10: Control Panel > Security and Maintenance), Windows Defender will not start but instead the system opens at 'C:\Windows\System32' folder. How to Turn On Microsoft Defender Antivirus in Windows 10 Unsure if it's switched on? Read on to learn how to switch Microsoft Defender Antivirus on. Microsoft Defender Antivirus the default antivirus option for Windows 10, and it's always a good idea to enable it due to the protection it provides. Windows Defender, now rebranded as Microsoft Defender Antivirus, is a free antivirus application developed by Microsoft.