Uninstalling Windows Media Player worked. This lowered the version to 6.4. UT sounds are back.

>Maybe it's the same thing that happened to me. Fire up the windows media player and see what it's volume is set at.
>
>>All other wav files on my computer play at normal volume except for the Universalthread private and reply notification. Even if I clear the IE5 cache, they are still almost impossible to hear. Any ideas how to solve this?