Ok this is really really weird and I cannot determine why this happens, but here goes. My HP HDX 18 is running Vista Home Premium 64 bit. I have the 64 bit version of iTunes. Now, the music I have and everything plays fine, integrates perfectly with my Mac except this annoying sound in the menubar. Anytime I move the cursor from lets say "Library" to "iTunes Store' or any other option in the left pane, there is this "switching' sound the menu makes!!!! It annoys the hell out of me and I have never heard it on any other version of iTunes on a PC or my Macs. I have no idea what to do. I cannot find a preference for it, which leads me to believe it is something with an HP option, but I dont know. HELP!!!! The noise drives me nuts.