showwnd.exe is included with the Chicony keyboard software and is used by the software to stop the keyboard driver's taskbar entry from reappearing. It is not necessary to remove the keyboard software, however if you wish it can be removed through Add or Remove Programs.
Non-system processes like showwnd.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