That's because of VISTA user privileges... ( another bug ? )
It's easy though.
Just right-click the icon and select "Run as administrator". Then nRoute begins, and loads the maps.
Deniz Sevki Kayabay
www.kayabay.com
It requires Garmin maps to be installed.
CitySelect, CityNavigator, MetroGuide or Topo.
nRoute is incomplete until the maps are installed.