
Windows Defender Service Troubleshooting Checklist
If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...
Software troubleshooting desk

If Windows Defender won't start, won't update, or shows error messages like "Service stopped" or ...

You open Task Manager and see svchost.exe using 30% or more of your CPU. This is common in Window...

You restart your PC to install updates, and it hangs on “Configuring Windows updates” for an hour...

If you see an "Access Denied" error when Windows Security tries to open at startup, the antivirus...

If PowerShell isn't starting automatically when you boot your PC, a scheduled task, startup short...

If you've ever had a build pass locally but fail in CI because of unexpected dependency updates, ...