microsoftie21.dll is a Trojan.Lineage-ON. microsoftie21.dll monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %System%\Kerne121.exe %System%\microsoftie21.dll More info: http://www.sophos.com/virusinfo/analyses... Removal: Remove microsoftie21.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.