ataste.exe is a Trojan W32.Sdranck-W. ataste.exe spreads via open network shares. Related files: %System%\ataste.exe %System%\tasta.exe %System%\vanhoutt.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill ataste.exe process and remove ataste.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.