Audio cracks like this have nothing to do with the software. It's hardware related. As far as I can tell the pop you are hearing is excess electrical signal being sent through the wiring in your PC. There is no fix for this for laptops. For desktops, I would suggest testing first with a different soundcard and if that doesnt work then try a new case. I had this problem forever from an old Soundblaster Creative 3 soundcard. Replaced it, problem went away. Two years later, problem came back. Tried replacing the audio card and no work. Found a short in the case wiring, repaired it and suddenly all was normal. All ensure you have a surge protector on your PC and an adequate (and not dying) power supply - I've heard but not experienced that this can be a cause also.
Hope this helps.
