seti@home.exe is a unique screensaver offered by the SETI program which allows home and office users to contribute to SETI by offering CPU processing time when the computer is idle. This is a non-essential process.
Disabling or enabling it is down to user preference.
Non-system processes like seti@home.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.