With ADE running and reader connected, press Ctrl+Shift+E. If your reader is authorized, this will de-authorize it.
Then disconnect the reader, shut down ADE; next reconnect the reader and launch ADE. YOu should be prompted to authorize.
Now you can shut down ADE again, Launch Sony Library, and use the Book Import menu item to add the ADE titles to your library. You can also use ADE to drag the titles to the Sony (the reader will be seen as PRS505 in the left window pane of ADE).
Hope that helps.