If your Microsoft Windows Defender is not working with a yellow exclamation point in the tray and Windows Defender Security Center says "Threat Service Has Stopped" then here's how to get it running again and the most likely cause of it stopping.
This video about how to fix Microsoft Windows Defender Virus & Threat Protection Service Has Stopped or not working.
Follow the video
very easy steps
Open Run: type: regedit
HKEY_LOCAL_MACHINE
SOFTWARE
POLICIES
Windows Defender
(Click) DisableAntiSpyware change Value data="0"
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