expI0rer.exe is a mass-mailing worm W32.Mytob-FI. expI0rer.exe opens a back door on IRC channels. expI0rer.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\expI0rer.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill expI0rer.exe process and remove expI0rer.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.