We really need a sticky thread for the Vista Virtual Store. The Airnav bit of the Virtual Store is located at:
C:\Users\xxxxxxxx\AppData\Local\VirtualStore\Program Files\AirNav Systems
Where xxxxxxxx is your Vista logonid.
The Virtual Store, which Vista uses whenever a program attempts to write to files in the C:\Program Files area, is located at:
C:\Users\xxxxxxxx\AppData\Local\VirtualStore\
My advise to anyone installing Radarbox on a Vista PC is to NOT use the default installation, but use something like C:\AirNav Systems, and so avoid all the Virtual Store complications.