hdkp5b.exe is a Trojan.ExeBund-C. hdkp5b.exe opens a back door. Related files: %System%\bundle.ini %System%\empty %System%\I-Worm.Badtrans.pif %System%\I-Worm.BadtransII.pif %System%\hdkp5b.exe %System%\msblast.exe More info: http://www.sophos.com/virusinfo/analyses... Removal: Kill hdkp5b.exe process and remove hdkp5b.exe from Windows startup using antivirus (also check How To Remove section)Startup Optimizer.