I recently installed Avast 5 (installing it after uninstalling the old version first), however when there is a pop up notification, there is no sound, eg. there is no sound or voice over saying the virus db is updated. The settings are default, and the sounds are enabled in the settings, and there are sound files in the sound folder. Additionally, i've installed Avast 5 on a virtual machine using WinXP Pro, same as my pc, and the sounds work there. Any ideas?