lo71.exe is a Trojan W32.Sdbot-AGT. lo71.exe opens a back door on IRC channels. lo71.exe spreads via open network shares. Related files: %System%\lo71.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill lo71.exe process and remove lo71.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.