w3264.exe is a mass-mailing worm W32.Mytob-BO. w3264.exe opens a back door on IRC channels. w3264.exe tries to terminate antiviral programs installed on a user computer. Related files: %System%\w3264.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill w3264.exe process and remove w3264.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.