Then double-click Turn off Microsoft Defender Antivirus at the right-hand side pane. In the pop-up window, go to Computer Configuration > Administrative Template > Windows Components > Microsoft Defender Antivirus. Then type gpedit.msc in the box and press Enter key to open it. Press the Win + R keys to open the Run box. You can configure the operational state of Windows Security via the Local Group Policy Editor. Modify the Local Group Policy Editor Settings Ensure the Startup type is set to Automatic and the service is running. Then find and double-click Windows Management Instrumentation. In Services (Local) window, find and double-click the Remote Procedure Call (RPC) service. Then type services.msc in the box and press Enter key to open it. If the “Windows Security not opening” still exists, you can enable RPC (Remote Procedure Call) and WMI (Windows Management Instrumentation) services. Then find your third-party program, right-click it and select Uninstall. Besides, you can go to Control Panel > Programs and Features. You can try to disable the third-party antivirus program to repair this issue. Sometimes, a third-party antivirus software can cause the “Windows Security not opening” issue. Disable the Third-Party Antivirus Software Then follow the on-screen instructions to complete the process. In the pop-up window, click Advanced and then check the Apply repairs automatically box. Search Perform recommended maintenance tasks automatically in the Windows Search tool to open it. Run Windows Troubleshooterįirst, you can try to run System Maintenance troubleshooter to repair a system maintenance problem. Read More How to Fix Windows Security Is Greyed Out Solution 1.
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