rapapp.exe is a process belonging to the BlackICE computer Protection firewall. It informs you of any modifications to the system, such as changes in your files or folders and detects unknown programs trying to launch. This process should not be removed to ensure that your system is secure.
Non-system processes like rapapp.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