I've a (very) little idea to fix the problems, I'll try as soon as I can (if).
So, in the worse case, that version of the demo without sound doesn't work under Windows Vista and/or an ATI graphic card.
I think it could be the way I open the window or how I did the texture routine, the demo is pretty standard OpenGL 1.1, I didn't call any GL extension.
Sorry for that, and thanks for that great feedback.