If Windows Security is your antivirus of choice, just dont panic when the threat service stops working.
Hitting the Restart now button should quickly fix the problem for most users.
However, if the issue persists and you cant restart the service, pursue the troubleshooting steps below.
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How Do I Restart the Windows Security Threat Service?
Uninstall Third-Party Security Software
check that Windows Security is the only antivirus running on your rig.
If you also installed athird-party antivirus, verify to uninstall as it could be interfering with Windows Security.
Additionally, disable or uninstall third-party antimalware tools, even if in theory, theyre compatible with Windows Security.
Check your DisableAntiSpyware controls
Set the value of DisableAntiSpyware entry to zero and check the results.
By the way, if theres no entry for DisableAntiSpyware, youll need to create it yourself.
Right-hit an empty area in the right-hand pane, click onNew, and selectDWORD (32-bit).
Name the new entry DisableAntiSpyware and set its value data to zero.
However, you should only use this option if your system configuration is HDD only.
If youre using the SSD and HDD combo, scroll down to the second option.
ensure your box meets the hardware requirements for running the latest Windows version.
Youre going to use a USB drive to export the security services.
If nothing happens or you get an error code, disable Windows Security Tamper Protection.
LaunchWindows Security, go toVirus and threat protection tweaks, and toggle offTamper protection.
Try exporting the missing security service to your system again.
