Windows media play should update your music. Drag and drop the whole album in. If it dosent find the pictures your media player requires the settings changed.(download media information)
My peer block often firewall places like napstar.
Never have used itunes never will. Itunes format is different.
Could be possiably that the files you have downloaded are FLAC etc incompatible.
If your using mwp try and download mp3 mp4 etc.
Windows media player- organize-options-privacy.