EULSASS.DLL is a Trojan.Sharp-F. EULSASS.DLL opens a back door. Related files: %System%\IMMS16.DLL %System%\MCIOLES16.DLL %System%\COMAPI.DLL %System%\EULSASS.DLL More info: http://www.sophos.com/virusinfo/analyses... Removal: Remove EULSASS.DLL from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.