If the objects or scenes still don't show up after what Shari123 said, you have to create new libraries. That's really simple: on the open dialog (object, scene, whatever) there's a small icon on the bottom left with the shape of a blank page. Click on it, point Vue to the folder where the stuff is and Vue will permanently add that folder to the load dialog. You have to do this for the various kinds of objects you can load: scenes, objects, atmospheres, materials, functions, etc.

It's all in the manual... :-)