lamberw,
It has been advised for some time to install to somewhere like C:\Airnav, not only for Radarbox but for other software as well as installing to program files can lead to problems with the Windows Virtual Store.
If you have installed to there I would suggest uninstalling itafter saving all items from the data folder that you may like to keep such as photos, silhouettes, logos, Mylog.db3 etc. Once installed replace them into the data folder replacing the items already there.
After the automatic uninstall I would also get down and dirty and remove any orphan files left over.
Alan