rnwiau.rsd is a RNWIA.RSD
belonging to ScanSoft OmniPage
from Nuance Communications, Inc.
Non-system processes like rnwiau.rsd 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