In Figure 1, you can see what it looks like when Windows Security Service is running. To do so, open an elevated PowerShell session and enter the following command: Get-Service SecurityHealthService If Windows Defender stopped working, the first thing that I recommend is to check that the Windows Security Service is running. In this case, Windows Defender has been accidentally disabled or Windows is malfunctioning.įor the purposes of this article, I am going to assume that your system is not infected with malware and that you are not running third-party antimalware software.
Many types of malware disable Windows Defender in an effort to evade detection. This is because Microsoft Defender is enabled by default in Windows 8.1+ (and Server 2016+) and will even re-enable itself if its disabled and detects no 3rd party AV. 2 To Enable Windows Security for All Users. If this is the case, it is normal and no cause for alarm. 1 Do step 2 (enable) or step 3 (disable) below for what you would like to do. If you are using a third-party antimalware product, it may have disabled Windows Defender so that it can do what it was designed to do unimpeded by Defender. Turn On Real-Time Protection Click on the Windows icon in the bottom left of your screen to bring up the Start menu shortcut. There are three common causes for why Windows Defender may have stopped running. Click Yes in the User Account Control prompt. Occasionally, however, you may find that Windows Defender has stopped working. To use this scan, open the Start menu, search for Command Prompt, right-click the utility, and select Run as administrator. Normally, Windows Defender runs silently in the background, protecting your PC against various threats.
Windows Defender (now referred to as Virus and Threat Protection) is Microsoft’s native antimalware technology for Windows.
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