atiupdate.exe is a Trojan.Dloade-AAH. atiupdate.exe downloads code from the internet. Related files: %System%\atiupdate.exe %System%\msshed32.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill atiupdate.exe process and remove atiupdate.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.