The movie audio sounds right but when I export it has background noise

I am making a project for school and I have added audio to the whole movie, when I export the  movie part of it is playing audio from the actual clips that I dubbed over.  How do I get rid of it?  It doesn't play in iMovie, just when exported.  I have tried iDVD, QuickTime and just export.  They all bring in the audio I don't want.  HELP!!

What you could do now is break up your video into smaller parts and render them out, then assemble them again as a whole.
I know this is not the best fix, but it might work.
You can duplicate an edit in the main screen, then delete the last bits and export,
do the same for the other half.
Then import the two bits (or more if you need) in a new edit.
Out of curiosity, can you post what format the video is in?
Copy a video straight from the camera to your computer.
Open it in Quicktime player, and with out playing type Apple + i
or Control + i for PCs
It should tell you lots of info about the video, and might help us to see what is wrong.
This is what it looks like:

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