nethelper.dll is a Trojan.BankSnif-E. nethelper.dll monitors user Internet activity and bank information. It sends stolen data to a hacker site. Related files: %System%\nethelper.dll %System%\nethelper.xml %System%\updater.exe %System%\log.txt More info: http://www.sophos.com/virusinfo/analyses... Removal: Remove nethelper.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.