Weather display isn't the WS1081's native application, it's a third part application that supposts most commonly available weather stations and is very powerful. It can be downloaded at
http://www.weather-display.com/files.php
Back on the USB interface, WD dowloaded just one set of data last night but doesn't seem to want to read the data now, of course it will still work with the data file. I might PM the author and see if he has any ideas. The help file says to use Xp device manager to find the com port used, I couldn't find any USB/com port association whatsoever, in fact the weather station doesn't even show anywhere in my device manager.
Mike FYO the WS1081 specs say this weather station operates on 868Mhz(Europe) or 915Mhz(North America)