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Use noise removal tools. Also sometimes noise appears if the temperature is too high. Noise also can easily be seen in dark areas of the picture so avoiding dark areas might also help a little bit. But why don't you post a picture so we can judge for our selves how bad the noise really is.
First which camera are you shooting with, larger photosites produce less noise. Second overexpose the photo by 1/3 to 2/3 of a F-stop, this helps reduce the noise in your photo. Last Noise Ninja rocks. Darrin Van Gorder