kbdstub.exe is a process known as key watcher. It belongs to HP's Keyboard Handler and its main function is to watch multimedia keys on HP keyboards.
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kbdstub.exe is a non-Windows system file and it starts upon Windows start-up. It has a visible window but without file information. Technically, kbdstub.exe is potentially dangerous for your computer since it is located in the C drive's sub-folder C:\\program files\.
Non-system processes like kbdstub.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