Wow, what a party, eh?
Yeah man, lets all gather around a tiny laptop screen.
But what are they watching?
I think, in the German party, they are watching hardcore porn. The Asian girl, in particular, looks rather excited, possibly pointing at a huge wang. The bloke in the check pink shirt looks a bit worried, possibly he's inadequate in the trouser snake department. The guy sitting down is rather smug, probably because it's not his computer and he's just planted the porn on his flatmates work rig for a laugh.
It's possible the American version also features pornography on screen - certainly the black girl is even more amazed than our German based Asian bird. In this case, our computer operator, the large black guy, is also looking smug, possibly because he's a large black guy.
Then again, it may just be my imagination. Perhaps they are all laughing and/or incredulous over the windows 7 user experience, or maybe they are watching a Disney movie?
Whatever the reason for hi-jinks and photo changes, I reckon the balloons are in the American version as a reference point for "fun", just in case they don't get it.