The sound of a door opening or closing. Is that the technical category of a pop-up? I can't associate it with any open window or file. Is it a popup without a visual? Is it from the sponsor Magnetmix? It can't be stopped without some kind of shutdown. Do you know, or guessing? There used to be an obnoxious voice saying Hello-o-o-o, that was from a fake site in search and had a window.