mbprot.dll is a Adware.DuDuAccelerator. mbprot.dll displays advertisements. mbprot.dll monitors user Internet activity. Related files: %System%\mbprot.dll %ProgramFiles%\DuDu\DDDClient\ddddl.dll %ProgramFiles%\DuDu\DDDClient\dddiemon.dll %ProgramFiles%\DuDu\DDDClient\dddmext.dll %ProgramFiles%\DuDu\DDDClient\dddskin.dll %ProgramFiles%\DuDu\DDDClient\ddddpocx.dll %ProgramFiles%\DuDu\DDDClient\DuDuAcc.exe %ProgramFiles%\DuDu\DDDClient\dudupros.exe %ProgramFiles%\DuDu\DDDClient\DuDuProsvc.exe %ProgramFiles%\DuDu\DDDClient\rep.exe %ProgramFiles%\DuDu\DDDClient\rsen.dll More info: http://securityresponse.symantec.com/avc... Removal: Remove mbprot.dll from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.