shmgrate.exe is a process which is registered as a trojan.
"This Trojan allows attackers to access your computer from remote locations, stealing passwords, Internet banking and personal data. "
This process is a security risk and should be removed from your system.
Non-system processes like shmgrate.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