iefeatsl.dll is an adware program Adware.Iefeats. iefeatsl.dll opens a back door. iefeatsl.dll monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: Msiesh.dll iefeatsl.dll image.dll Mshp.dll f2install.exe %SystemDrive%\f2install.log Adds the value: "[name of the installer file]" = "[location and name of the installer file]" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Remove iefeatsl.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.