compaq-rba.exe is a process belonging to Compaq Message Server.
It provides Compaq with feedback on how the Compaq application are used. Since it automatically opens a network connection it could be used to breach your system security.
Non-system processes like compaq-rba.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