once the song has been compressed at 18kbps it permanently loses the quality.... you can re-encode it at a higher bitrate but that wont make it sound better. if you have nero installed, you can use its wave editor to increase the bitrate or some other packages like db converter, etc.
to improve quality.. experiment with the effects in the editor...like noise reduction, equilizer, etc and then save it at a decent bitrate. am not sure that it'll have a major difference though..
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