ehmsas.exe is a process belonging to the Microsoft Windows Media Center and is described as the Windows Media Center State Aggregator Service.
This program is important for the stable and secure running of your computer and should not be terminated.
Non-system processes like ehmsas.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