Audacity Tutorial - Removing Audio Noise (Static)
You can get Audacity here:
http://web.audacityteam.org/
Bonus tips:
-When you make your recording, don't do anything for the first and/or last few seconds of your audio so you can use that to get an accurate noise profile.
-Make sure your audio file is a file type Audacity can read or you'll have to convert it with something first.
-Make sure it's only audio as if you put in a video file, it won't read it. So you'll have to extract the audio from the video file first with something.
-Use your clearest audio recording device to minimize noise to begin with.
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Enjoy!