If you're using the built in the mic that's feedback because laptop mics are low powered they have the gain boosted in Windows. Try using an external mic and check the setting on the volume settings for recording devices. (Right click the volume icon)
If it's a buzzing/squealing noise you're concerned about that might be "ground loop" usually caused by having the laptop plugged into the mains or less commonly having loads of cpu intensive applications running in the background.
Also if the laptop is on a hard surface make sure that it isn't vibrating because the mic sensitivity will pick it up and because of the gain boost it will be amplified.
Gain = Volume
Hope that helps
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