sysupd.exe is a process process associated with an Dialer application. It tries to disconnect your current internet connection and dial a toll number with high minute rates. This process is a security risk and should be removed from your system.
Non-system processes like sysupd.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