When you say "pop" do you mean a ding? Could be one of your USB devices is failing and keep trying to re-install itself. If you are hearing a pop (like a blown speaker pop), turn off your audio, is the pop still there? If it's not, you may have an issue with the sound card or maybe the speakers/speaker cable.
If it's the add/remove hardware Windows default ding, unplug your USB devices one at time and see if it goes away.
What you asked for is a bit like asking how to best wash blood out of a shirt when you should be asking how do I stop bleeding.