I have 2 laptops (one is mine and the other one belongs to my wife), both Aspire 5738z, with Windows 7 installed on them. The microphones stopped working on both of them this morning. I can still find the microphone on one of them, but I am unable to change its settings. The speakers also makes a very loud noise if I try to call anybody on skype or yahoo messenger. On the other laptop the microphone is simply missing (like it was never installed). I was able to use them yesterday afternoon, but not today. Can it be because of a windows update? Do you have any other explanation?