To accomplish this task, follow the steps from this Quick Malware Scan and Removal Guide. Restart it now' in Windows 10, is to make sure that your computer is 100% clean from harmful programs like rootkits, malware or viruses. Important: The next step to resolve the Defender error ' Threat Service has stopped. Restart it now' error in Windows Security center is just an informational message. Uninstall Third-party Antivirus.įirst of all ensure that you haven't installed any other third-party antivirus on your machine, because when you install a third party antivirus in Windows 10, the Windows Defender security is disabled automatically, and the 'Threat Service has stopped. Restart it now.' How to FIX: Threat Service has stopped.

This tutorial contains instructions to fix the following problem in Windows 10 Defender Virus & threat protection status: ' Threat Service has stopped. Restart it now.' The easy way to fix the problem, is to press the 'Restart now' button to start the threat service, but in some cases this doesn't work and you receive a new error message that says ' Unexpected error, Sorry, we ran into a problem. On a Windows 10-based computer, the Defender Antivirus Security Center may encounter the error: ' Threat Service has stopped.

Windows defender not turning on