Antivirus software has been installed and then removed, but its settings are still present preventing Windows Defender to start. Here are some of the reasons why Windows Defender may stop working, or encounter problems when trying to restart: A virus infection may have changed registry settings and Windows Defender is unable to operate or start. Click or tap "Windows Defender" from the results window to launch the application. The Search charm will open to recieve your input. Open the Start screen and type "defender.". How do i open windows defender on my computer?
Other reasons for this issue might be malware infections, software conflicts (possibly with another antivirus program), a corrupted registry, etc.
One of the possible reasons for users being unable to turn on Windows Defender is third-party antivirus software installed on their Windows operating systems. To turn Microsoft Defender Firewall on or off: Select the Start button > Settings > Update & Security > Windows Security and then Firewall & network. To restart Windows Firewall service, do the following: Go to Search, type services.msc, and open Services. Frequently Asked Questions How do you restart windows defender?
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