Not sure about getting rid of your doubled songs. Is that in your music library created my windows media player?
Easiest way to transfer songs to blackberry: provided you have a media card installed. On the device go to options/media card then enable mass storage mode. Also select to automatically enable mass sorage mode when connected. Hit back key and save. Now hook up the device via the us cord and go to my computer. The blackberry will show up as a device with removable storage. Open it then the blackberry folder. Drag and drop your media files into the folders you want them in.
