HostSVC.exe is a worm W32.Rbot-ANZ. HostSVC.exe spreads via open network shares. HostSVC.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\HostSVC.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill HostSVC.exe process and remove HostSVC.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.