t42qvknq.dll is a Trojan.Graybir-AE. t42qvknq.dll opens a back door. t42qvknq.dll monitors user Internet activity and private information. It sends stolen data to a hacker site. Related files: %Windows%\twunk_64.exe %Windows%\t42qvknq.dll More info: http://www.sophos.com/virusinfo/analyses... Removal: Remove t42qvknq.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.