To keep it short.
So, if anyone has the same problems with vista do the following:
Run the Programm as Administrator, altough Vista will ask you thousand times not to do it -> Just do it and everything will be fine.
Thanks for your fast help! I am sending flight informations again to airnav network!!!
Here are the details:
I´ve entered the adminstration code already so often, that i do not even have to look it up anymore.
Such a perfect programm like Radarbox on windows VISTA is awful. But it is definitely not fault of airnav.
I am going to switch back to MAC or Linux asap. This is definitely the best decision.
Airnav is runing now. I started the process with Admin rights. Suddenly Vista could load the USB driver for the radarbox and the programm works perfect again.