So, you need to check if the environment variables have been set correctly. This may cause the Windows Defender to not work. Installing third-party applications can cause changes in the environment variable of Windows. You have to run this tool from the command prompt. DISM stands for Deployment Image Servicing and Management tool, which services the corrupt Windows images. If, for some reason, the SFC scan did not yield any result in fixing the Microsoft Defender, then you can use the DISM scan. If you aim to solely use the Windows Defender program, then make sure to uninstall other antivirus programs installed on your PC.įor uninstalling the antivirus, 5. To avoid any conflict, do not use multiple antivirus programs on your PC. Remove the Third Party Antivirus Solutions # To get rid of bugs on the existing Windows OS build, check if a new build is available to install. Often something as simple as restarting a PC can fix a lot of technical snags that may be occurring randomly. Otherwise, any interruption during the installation of Windows OS may lead to the corruption of certain system files. You may have installed any application incorrectly on your PC. Start by scanning your PC for corrupt system files. Let us check out the troubleshooting tips to get the Defender service on your PC working again. Even a buggy Windows OS build may showcase such glitches. Otherwise, corrupt system files may also cause the Windows defender to become unresponsive. This may happen due to permissions not being granted in the ProgramDataMicrosoft directory. Often the users may get an access denied error while trying to run Windows Defender. Due to changes in some system settings, Windows OS doesn’t allow Defender to run. It happens when you are trying to run a third-party antivirus. When the Windows Defender doesn’t start on Windows 11, it is usually accompanied by an Error 577. Those users who cannot afford a premium third-party antivirus can use the Microsoft defender as their primary tool to secure their PCs against viruses.
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