Today I did a complete download & install of GalCiv II, DA & TA and not only are the tutorial movies missing but the Tutorials button on the Main Menu is greyed out.
And as soon as I tried to start a game it crashed, but that's for another thread!
I found the solution!
I went to this thread
http://forums.impulsedriven.com/345195
to participate with my crash problem. I downloaded the reg file. It simply adds "English" to the language keys for the three games.
My GalCiv2 registry key had "Language" blank and both DA & TA didn't even have a Language key.
When I started the game the main menu text looked a lot better and the tutorial button was now there and so were all the movies.