what is setup.exe
setup.exe is a setup application for many programs. Whilst a piece of software is installing this process will appear. It should not be terminated unless it has crashed for a considerable amount of time. Non-system processes like setup.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.