Hi. Has anyone else heard a noise that sounds like a creaking door opening and then slamming shut? It's very loud. I have heard it twice now and was downloading with LW both times. I am very computer illiterate. I have Windows XP with Norton antivirus. I haven't noticed any changes in the way my computer is running. The first time I heard it I shut my computer off. This time I came here for help. Does anybody know what it is? Thanks