CtxPopup.dll is an adware program Adware.CtxPopup. CtxPopup.dll is a Browser Helper Object. CtxPopup.dll downloads and displays advertisements. Related files: %System%\contextual.exe %System%\CtxPopup.dll More info: http://securityresponse.symantec.com/avc... Removal: Remove CtxPopup.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.