For who is concerned, those killbits are blocking specific exploits in mentioned softwares: HP Instant Support, Aurigma Image Uploader, Symantec WinFax Pro, Google Desktop Gadget, Facebook Photo Updater, PandaActiveScan Installer, ... [see KB953839 & KB978262], but not malwares. You can copy the 196 Clsid (or part of them) in the 'update.inf' file.