It thoroughly scans patch vulnerabilities, Startup items, plug-ins, services and processes, etc., in the system with its rapid and stable search engine to diagnose possible security threats and protect your system from the threats of spyware, adware, Trojans and viruses. Windows Doctor also provides functions such as Registry Cleanup, Privacy Cleanup, System Speed-Up and Advanced Tools. They help you clean up garbage information in the registry, protect your privacy, make your computer run more stable and with better performance.