Greetings. I do not know when this started, I believe after an update, but I'm not sure. Many, but not all, times when Win7 wants to "ding" me to signal something, instead of the normal pleasant "ding", it is a LOUD distorted screech, which ends with a slight ding. Is it a corrupted driver? How can this be corrected? The Mac host OS does not do this. Any advice or ideas are welcome. Thanks.