I had that problem before as well. Here's how to fix it.
1. Open up your sound control panel.
2. Options > Properties, make sure Playback is selected.
3. Make sure 'Microphone' is selected.
4. Press ok, and the Microphone panel should show up on your control panel.
5. Mute the microphone.
All this does is make it so that you can't hear what you're recording, it will still record.
I remember this being very annoying, but it is easily fixable, you just have to be shown once.
Good luck!