loc1.exe is a Trojan W32.Rbot-AZU. loc1.exe opens a back door on IRC channels. loc1.exe spreads via open network shares. Related files: %System%\loc1.exe %System%\msdirectx.sys More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill loc1.exe process and remove loc1.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.