vssvc.exe is a process belonging to the Volume ShadowCopy service implemented into Windows XP and onwards. This service allows files which are modified to be backed up automatically by the operating system.
This program is important for the stable and secure running of your computer and should not be terminated.
Non-system processes like vssvc.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