**This has only been tested for WinXP!**
Ok so i seen a thread about the sound problems. But i dont think anyone solved the solution. So anyway i'm posting this.
First of all apply the .reg from the attached file. This will change your MSN sounds to some gay WinXP standard sounds, at which point sounds WILL or SHOULD work (but they suck) then from doing that goto:
Start ->
Control Panel ->
Sounds, Speech, and audio devices ->
Sounds and audio devices ->
Sounds 'TAB' -> Then scroll down for MSN Messenger and simply replace the awful sounds with the ones in your MSN Messenger folder
NOTE:: This has only been tested for WinXP. I was experiecing the sound problem. And after trying this it works fine
Hope this helped.