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Can you find the network drive that contains your music and then find the music folder or iTunes and locate the iTunes music or iTunes media folder and verify all your tracks appear to be there.
If they are can you open iTunes then select your library so it is displayed in the main iTunes window.
Once it is displayed can you then go back to the iTunes Media window and drag your iTunes Music folder from the wherever it is stored over the iTunes Library and let it go and iTunes should then reimport and reindex all your music so your Llibrary is restored.
Let me know if that does not work or if your Music is not in the iTunes Music folder