npnj5agent.exe is a npnj5Agent
belonging to nProtect Netizen Agent
from INCA Internet Co., Ltd.
Non-system processes like npnj5agent.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.