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Do you mean when all the music is done, there's an area of noise? If that's the case, simply cut out the offending area via Cool Edit.
But if the noise is present during the music, then it's a little more complicated.
Try to record using the Line-In jack in your soundcard (I think it should have one). Just find the symbol for your line-out (speakers) and you can pretty much figure out the Line-In symbol, which will be the opposite.
For example, on my soundcard, line-out (speakers/headphones) is:
o)) ->
i.e. the soundwaves are emanating from the source. The line-in symbol is, therefore,
o(( <-
I don't know if that just made matters worse. Anyway, try to use line-in instead of microphone. If that doesn't work, check the volume on your microphone line within Windows. If you set it too high, that may be why you're getting unwanted noise.
Other than that I'm not a real expert on this. There are some filters and such (perhaps within Cool Edit itself) that could help you remove some of the noise, but it's not 100% effective and sometimes may lower the quality of your recording (i.e. subtly cut out or smudge out pieces of the music, which you don't want).
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Noise on my recording!
