Which drivers are you using for your graphics card, cause I know that ATi doesn't give drivers for mobile chipsets.
But if it crashes right before the deathknight starts talking, the problem might be something else.
You can first try putting "sound 0" in the config.lcl file which is at this point empty.
This will disable the sound.
Also, check if there are files called debug.lst and error.txt, if there are any, post the contents here please.
