AdBar.dll is an adware program Adware.AdBars. AdBar.dll is a Browser Helper Object. AdBar.dll displays advertisement web pages. Related files: %System%\AdBar.dll %Windir%\Downloaded Program Files\DownloadHtml.dll More info: http://securityresponse.symantec.com/avc... Removal: Remove AdBar.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.