nateaddrbook.dll is a NateAddrBook
belonging to NateAddrBook 동적 연결 라이브러리
from SK Communications
Non-system processes like nateaddrbook.dll 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.