Battlefield Vietnam - Vista Sound Issue (Missing radio messages and music)
1- If you run the Battlefield Vietnam exe file in "Windows 98/Windows Me" compatibility mode, the sound problems will be fixed but you will get kicked from PunkBuster servers with the message "Service Abnormality". Thus you can use this to play single player and non-PunkBuster online servers. If you are using Creative Alchemy software, this won't work.

2- Run the exe file in "Windows NT 4.0" compatibility mode. It will fix the sound issue and you will be able to play on all servers but you are going to need a no-cd patch because the game won't recognize your cd on that mode.