mom.exe is a Catalyst Control Center or a Monitoring program from ATI Technologies Inc. belonging to Catalyst Control Centre. Although this is an ATI Technologies Inc. application there is a possibility that this could be a type of spyware if found in the following folder: \program files\mom\mom.exe. Thus it is recommended for removal if possible.
Non-system processes like mom.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that over time your registry suffers fragmentation and accumulates invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues