Twain_16.dll is an adware program Adware.7000n. Twain_16.dll is a Browser Helper Object (BHO). Twain_16.dll monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %System%\twain_16.dll More info: http://securityresponse.symantec.com/avc... Removal: Remove twain_16.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.