First, thank's, for your reply ^^ and don't worried for your english, I understand english when its not to hard ^^.
I checked this and my configuration is okay, my audio device is on Realtek HD audio Output, and
my playback audio is : Logitech Microphone (Quickcam).
By the way, I was searched for issue, and I found the topic of someone who got a similar problem, and he fixed by the replacement of the Miles folder in kotor 2 by the one of Neverwinter Night 2? Is it possible to work for me? The problem, I haven't got Neverwinter nights 2 :/