Defender fails to activate on Windows 8.1
Defender fails to activate on Windows 8.1
After the Windows update, Defender stopped working properly. It would freeze and then crash when trying to turn it back on. I thought it might be a virus, but tests with trusted tools like MalwareBytes came up clean. It could be a glitch from the update or something else entirely. I’m worried and need help right away.
Have you added another antivirus program? Only one security solution should be active at a time. Ensure Windows Defender is running. If it doesn’t resolve the issue, perform a Windows repair. Launch Command Prompt with admin privileges (Win+X or right-click Start), and choose Command Prompt (Admin). Execute the command: sfc /scannow, then press Enter. The scan may take some time; your system can remain operational during this. After completion, restart your computer. If needed, proceed with a full system reinstall for added protection.