isstart.exe is a process installed alongside Logitech QuickCam drivers and offers additional support for images and video streaming output. "This program is a non-essential process, but should not be terminated unless suspected to be causing problems. "
Non-system processes like isstart.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