n.dll is an adware program Adware.AFAEnhance. n.dll is a Browser Helper Object. n.dll monitors user Internet activity. Related files: %Windir%\system\QB.exe %Windir%\system\QBTool.exe %Windir%\system\QBUninstaller.exe %Windir%\VCMNet11.exe %System%\n.dll Adds the value: "[File path]" = "%Windir%\[File path]" to the Windows startup registry keys. More info: http://securityresponse.symantec.com/avc... Removal: Remove n.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.