I have an issue where my computer makes the "ba-dum" sound randomly and hangs for a moment, but I haven't connected or disconnected a drive. It seems only to happen when I am moving the mouse. I noticed it for the first time after Norton 360 started telling me I needed to buy more online backup space. I also noticed that the Norton backup drive, which shows up as an "other" folder in my "computer" folder would pop in and out in time with the sound. I called Norton technical support. They were terrible, so I uninstalled Norton. I downloaded a trial of Vipre instead. When I installed Vipre, it said that Norton had not been completely uninstalled. I couldn't find any Norton programs in my program manager, so I installed Vipre anyway. The sound and hangups are happening less frequently, but they still occur. I no longer see a drive popping in and out on my "computer" folder. Can anyone help with this situation?