do a forum search, there's lots of info on how to make map loader work on n900 - XP works out of the box, but IIRC you have to run vista 64 bit in XP compatibility mode for it to work. Worked fine for me on XP when I did it a while back, but I think only USB mode is supported for n900 (ignore the prompt objecting to it). Oh, and bring a good book to occupy you - the d/l & transfer for Europe took ~2 hours to complete :-)