Is the sound in the cinematics choppy? I.e. people will say something and part of what they're saying is lost? I had the same problem with Advent Rising, along with the cinematics themselves seeming to run a little slow.
I think it's a problem with Bink video files, or how the game handles them. I've had the problem before and the fix, at least for me, was simple. I solved it by downloading and installing the RAD video tools. You can find the package here: http://www.radgametools.com/bnkdown.htm
It's the very first link. You may need to restart your computer for it to take effect.
If that doesn't work, you can always try to replace the binkw32.dll file in the game folder with one from a different game. If the program throws up errors at startup, the version of the DLL you used may be either too old (or far too new). I've solved video playback stutters this way on a number of more recent games, like Gas Powered's Demigod.
Let us know if any of these solutions worked for you.