Also make sure that windows uses window media player to play all kind of video files
if you set up another program to do this, then the intro movie wont appear.
reinstalling the vid card driver and reinstall windows media player might also do the trick.
I had this problem with Rome Total war when I let Winamp to do my media files. the intro movie was gone, the menus was screwed (because of the video in the background) but when i saw that Windows was using winamp for all video files I set them back to Windows media player and that solved the problem.
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