pptd40nt.exe is a process that belongs to ScanSoft PaperPort. It allows individuals and businesses to organize all their documents in one application.
Non-system processes like pptd40nt.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that over time your registry suffers fragmentation and accumulates invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues