I can't find much on this topic but this thread is almost a year old.
People were stating it is a Silverlight 4 problem, but we are now on Silverlight 5 and it seems the problem still persists. Just like that topic states other HD videos work fine.
Edit : Also a lot of the reviews were saying it streamed Netflix fine, but did not state if it was HD. The netbook does come with an AMD sticker that says HD Internet so I would hope that something like Netflix HD streaming would be something that worked.--
Mets, Cowboys, Devils