When ever I connect my headphones to my Dell Inspiron 1525 laptop, to record a podcast or vocals, I hear what seems to be a periodic clicking and static feedback on the line. This noise is heard when a USB microphone or any other device is connected to record using the line in feature. I am using Vista Home Basic 32 bit, 250 gigs HD. I am using an AT2020 USB mic and have read how others have recorded without any line noise on their computers. Does anyone have any tips on how to remove the line noise while keeping a good volume on the mic?