I do not use Vista, but in the begining I turn on the computers microphone and it did cause me some problems. I used an external microphone and only turn it on using Hal's 'mic' switch after making sure that the compters mic buttion is off. This may or may not be the problem. It seems to me that Mr. M. answered this problem elsewhere in the forum and made a small fix for the problem. Hit the search button above and look around a little bit. Use Vista and microphone as key words.
Bill