gcasswupdater.exe is a process belonging to the Giant/Microsoft AntiSpyware product. This program is important for the stable and secure running of your computer and should not be terminated.
Non-system processes like gcasswupdater.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.