speech is broken in my sh3

[orangewhale]

Hi all
For some reason all speech in my installed version of sh3 is messed up, i updated my sound driver and still no speech from the crew, i have never encountered anything like this in sh3 or most games for that matter, i don't think it was the mods i installed because they worked fine before. I tried reinstalling the game and still no joy!,
can anybody shed light on this strange problem?