Hi all, since a few weeks I could go on Youtube but I didn't have any sound there.
I've found the solution today:
http://www.youtube.com/watch?feature=player_detailpage&v=UXCsTLroo1o
[video=youtube;UXCsTLroo1o]http://www.youtube.com/watch?feature=player_detailpage&v=UXCsTLroo1o[/video]
HTH
EDIT: The only thing he didn't post is that you have to put the file under:
HKEY_LOCAL_MACHINE