Illegal operation attempted on a registry key that has been marked for deletion – Error in SharePoint Site

SharePoint site gave an error message in browser “Illegal operation attempted on a registry key that has been marked for deletion” .

Resolution:

Not sure, What went wrong, But I did an Application pool recycling, which made the site up!!! When the same error occurred during a Search, I Restarted “Search Query” and “Site Settings” Services from Services on Server to fix this issue.