360 Security Guard is a completely free online security auxiliary tool software launched by Qihoo. It features several powerful functions including detecting and removing prevailing Trojan horses, cleaning up malicious comments and system plug-ins, managing application software, Kaspersky antivirus, real-time system protection, and repairing system vulnerabilities. It also provides specific auxiliary functions such as comprehensive system diagnosis, popup plug-in immunity, cleaning usage traces, and system restore. Additionally, it offers a comprehensive diagnostic report of the system, enabling users to promptly identify issues and providing every user with all-round system security protection.