Choppy voice when recording

I just purchased a Gateway laptop with a built in microphone. I want to use audacity with a external mic(headset) to make songs. Whenever I record my voice it is very choppy and sounds terrible. Could it be my computer settings, audacity settings, sound/audio card, or that I am using a external mic with the built in mic still working? I have used audacity before with my previous laptop and it worked fine. I would appreciate any feedback! Thanks!

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