Darren,
if you are using WIN10 you have to download and install signed windows drivers
http://www.airnavsystems.com/Download/ANRB/Drivers/ANRB-Drivers-20161222.zip for the old RadarBox hardware.
- Unzip the content of the zip folder to something like C:\AirNav Systems\Drivers
- after that go to device manager and look up AirNav Systems RadarBox
- Use right mouse click and select driver update
- select manual update and point to the folder with the unzipped driver package
- additionally select Include subfolders
- click on continue to install the drivers
Once the drivers are successfully installed radabox should run again. WIN10 updates or WIN10 revision updates (1-2 per year) usually are not causing any further trouble with the RadarBox drivers.
If you have installed ANRB.exe to Program files location youm must be aware of the fact, that you won't be able to get a stable operatipn of ANRB.exe.
Ingo