css3rde.dll is a 3rd Parties Scan Engine
belonging to Anti-Virus APIs.
from Command Software Systems, Inc.
Non-system processes like css3rde.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