Kingsoft PC Doctor, professional computer security utility, intensively cleans Windows traces, repaires Windows vulnerability in overall and, deeply optimizes Windows OS and, to improve local computer to be operated with advance performance; as well as exploits revolutionary Kingsoft Cloud Security Engine and powerful Kingsoft V10 Antivirus Engine at local to defense billions of malicious Trojan viruses program away. Outstanding Features: Powerful Trojan Virus Defense Anti-Trojan function of Kingsoft PC Doctor exploits both the revolutionary Cloud Security Engine and powerful V10 Antivirus Engine on local device which are presented by Kingsoft Security to defense billions of malicious Trojan viruses program away from your computer. Efficiently Fix Windows Vulnerability Repair function of Kingsoft PC Doctor provides computer users overall and intensive Windows OS vulnerability scan service and, support the users patch such vulnerability in fast and easy-to-use operation. Meanwhile, the Windows Vulnerability Repair function presents advanced performance on Microsoft Windows 7 OS. Great Windows System Optimizer Optimizer function of Kingsoft PC Doctor executes deeply scan and fix errors of Windows System, support computer users to manage and speedup Windows Startup Options to greatly enhance performance of Windows. Excellent Windows PC Cleaner Cleaner is a powerful function of the Kingsoft PC Doctor which is designed for cleaning Windows OS unused files and temporary files, erasing traces of online activities and Internet history, and cleaning Windows register. Users can execute One-Click function to run the Cleaner to free up valuable computer hard disk space.