Recently I started hearing this "popping" sound. I can't say exactly when it began, but I noticed it the last several days, and I've been using NOD 32 for about a week. When I hear it, it will usually repeat itself every few minutes. It sounds like that noise you made as a kid (and possibly as an adult!) by putting your finger in your mouth with cheeks blown up and flicking it out. I thought maybe it was a popup blocker from firefox except that I've heard it with firefox closed. I've heard a very similar if not exact sound from Utorrent, whenever a download completes. Are there any sounds that NOD32 makes for any reason? If not, does anyone have an idea what I'm hearing? It's not all the time, and I haven't been able to associate it with any program yet.