I assume you have AVG Anti Virus installed. If so do the following, double click on the AVG icon next to clock on the right hand corner of your screen.
Go to Tools -> Advanced Settings -> Execptions (under Resident Sheild) -> Add path -> Enter your path to AirNav Systems which is usually:
C:\Program Files\AirNav Systems\
(Location may be differen if using Vista)
Then click apply and run RadarBox 2009 and tell us whether it works.