sear: The Witcher has many, many audio issues, based on all the discussion I've seen on its official site. Chances are the problem with the video might be related to codecs you have installed on your system - I recall a few years ago that the intro video did not play properly for me until after I made sure ffdshow wasn't being used in it. Either way, though, it's not that big a problem in the end. Watch it outside of the game to make sure it plays properly, maybe?
Good tip, I'll take a look at the installed codecs.
In may case it's not like just a little sound skip, I miss the sound on almost 2/3 of the intro but with intermittent blips from time to time (where sound "tries" to reappear). I have this issue only during movies (intro and ingame movies). During gameplay everything is fine.
I haven't tested yet if the movies can be played properly separately.
PS: Now I'm at work having a slight headache because I stayed late tonight playing witcher... :)