Hi Dawn - the settings for these sounds can be changed. Go to "START" "CONTROL PANEL" "SOUNDS & AUDIO DEVICES" and at the top click on the tab labeled "SOUNDS"
All the ones that show a little speaker in front of them are set to play. Just scroll down the list and when you find one you want to change, left click on it and a little window will open. If you scroll to the top you can select "None". Go through the list and make all the changes you want. Once your done click "Apply" and you're done. Hope this helps!
Bruce, June 2008