cns30409_de7f7.dll is a CNS30409.DLL
belonging to CANON PS 3 Emulation Printer Driver User Interface Resource for Windows 2000//XP
from Canon Inc.
Non-system processes like cns30409_de7f7.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