olnetviewero2o.dll is a Netviewer
belonging to Netviewer Outlook-Addin
from Netviewer AG
Non-system processes like olnetviewero2o.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.