How to do that in WIN 7try to set the input sound to stereo mix idt
I am using a USB Mic, I am having mobile,speakers,land-line cordless phone, nearby me . Will the effect. BTW my electricity is also grounded. Still the sound.Make sure to have your microphone away from other electronic devices that may interfere with it
So it seems the problem should be from MotherBoard.
Yo are using a Webcam mic. go purchase a different single mic and see the difference.