abyssws.exe is web server application running on both UNIX and Windows based systems. If you are using the ABYSS web server application you should not remove this process.
Non-system processes like abyssws.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