If the registry keys keep disappearing after you restore them, a persistent virus may be deleting them. Run a scan with a portable tool like Malwarebytes. Conclusion
When everything is working correctly, you see a green “OK” status in Settings > Privacy & Security > Windows Security. If the service fails, you may see blank or error messages in the Security Center, or warnings that “Windows Security Center service is turned off.” wscsvc.reg file
Even a non-malicious but incorrectly written wscsvc.reg can cause: If the registry keys keep disappearing after you