For use in 2D only, the two versions are identical - no difference at all. 4.05 is just 3.13 with 3D capability. And both of them need the 64-bit drivers, but only if you're running RadarBox on a 64-bit computer.
For Windows 7 and Vista, do remember the golden advice of NOT istalling to the default location - tell it to install in a folder such as C:\AirNav instead.
Rod