helpsvc.exe is the help service for Windows 2000 and later. This process initiates a pop-up screen whenever you press the help button.
Non-system processes like helpsvc.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.