Hi,
here's two videos on Youtube that have the lyp sync problem :
Dark Dark Dark - Wild Goose Chase (live at Le Poisson Rouge) - YouTube
Johnny Flynn and Laura Marling - The Water - YouTube
The first one was the one I had problem with in media player (I extracted the video in flv) but I jave the same lyp sync problem on Youtube.
Also, I have tried to delete the key you asked me in the windows registry but it appears that I don't have it.
Here's a screenshot of my registry : https://imagizer.imageshack.us/v2/1269x745q90/661/5dCaQp.png
Hope's it'll help you a little. Thanks again for looking into it.