birdihuy.dll is a Trojan.Proxy-U. birdihuy.dll tries to terminate antiviral programs installed on a user computer. birdihuy.dll monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %System%\birdihuy.dll More info: http://www.sophos.com/virusinfo/analyses... Removal: Remove birdihuy.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.