Atomic-x27.exe is a worm W32.Katomik-A. Atomic-x27.exe spreads via open network shares. Related files: %Windows%\AtomicpartC.exe %Windows%\K-set.bmp %System%\Atomic-x27.exe %System%\mastoer32.dll More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill Atomic-x27.exe process and remove Atomic-x27.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.