Assuming your Virus databse is current then hopefully not !
Try searching your PC using the "Find Files" or "Search" feature from your Windows start menu and enter RNA ADMIN to see where this file is located.
This may provide a clue e.g. if it appears in a Program folder you don't recognise then it could be some sort of Spyware or similar and you can then deal with it / uninstall it...
You can also try the good old CTRL-ALT-DEL to see exactly what programs are running on your PC and hogging the CPU usage.
Good luck !