I'm having exactly the same problem I'm running the HD 5700 too but my system has a higher spec
initially it was the DX crash
but after I down rated the graphics acceleration 'changing in game graphics options from ultra settings to high the driver stopped falling over
and begins to load the cut sceen, but its not a fix as the game then closes as you describe
This problem is happening with both of AMD's latest drivers 14.9 and 14.11 beta
It's really frustrating as you can't up date or resinstall Directx on Windows 7 as attempting to reinstall just generates a message that you 'already have the latest version'
It's literally a show stopper game progression wise
