hpppt.exe is a HpPPT
belonging to HP ScanJet Parallel Port Test Utility
from Hewlett-Packard Company
Non-system processes like hpppt.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues.