as you can read in posts i made earlier here, me also was convinced that i entered a false serialnumber, it turned out that it was a internet option problem : for some reason RB did not connect to internet since i installed 4.03 ( also not under 3.13 that was still installed ), i changed in IE internet options my LAN connection from manual to automatic configurationscript, and that did the trick : i got internet connection, and 3D was running before i knew it.
now, i'm not saying this is the case for other users with problems, but check if you do actually have internet connection, this can save you a lot of time to get help from Airnav, while in fact there is no problem ( except for the connection )
if there are no pictures of new entry's, ore no connection to network ..... chances are high you got the same problem i had.
just trying to be of any help :-)