monwow.exe is a process from Symantec. It monitors the installation process for new software to be able to help you uninstall these software successfully.
Non-system processes like monwow.exe 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