iwctrl.exe is a part of NovaDisk InsertWrite and allows you to use the packet-writing facilities of this CD writing suite. In this way a a user can burn files to the CD as if using windows explorer. This is a non-essential process.
Disabling or enabling it is down to user preference.
Non-system processes like iwctrl.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