

One of the common issues we have seen in the past is when there are multiple security software installed. Windows is designed to detect the presence of security software installed, and we often get to see the notification in the Action Center. One of the most common behaviors of Windows Defender is that if it detects a third-party antivirus software, then Windows Defender will shut itself off.


If you are unable to start Windows Defender, then one of these suggestions is sure to help you: If you face this issue, then this post may help you.Ĭan’t turn on Windows Defender in Windows 11/10 However, because this is a temporary solution, the next time you restart your computer Windows Defender Antivirus will re-enable automatically on your machine.When I browse through forums I often find this question asked many times – I am unable to turn on Windows Defender manually or Windows Defender won’t or will not turn on and start in Windows 11, Windows 10, Windows 8, or Windows 7. Once you've completed the steps, the Windows Server 2019 antivirus will disable its real-time protection temporarily, which is enough time to install Sisense.
