This is EXACTLY what happens to me!
After rebooting, it seemed to work again so I downgraded a couple of graphic options and turned off the intro sequence, figuring that might help.
Ever since I did that, I get a crash to my desktop when I try to start the game. I get the dragon splash page, and then right when the intro would normally start, I get one of those "Do you want to send this error to Microsoft" things, and the game crashes back to desktop.
Here's the pastebin:
http://pastebin.ca/1924794
It's very weird. The first time I tried running it, it seemed to work at first. I was designing my sovereign, and the game slowed down and finally just stopped. I had to pop out to my desktop and close it. Then when I tried to run it again, I got the black screen...the splash page, the music, but just a black screen. After rebooting, it seemed to work again, but changing a few options meant I had to close it and restart for it to take effect.
And now I get this crash. Every...time...
I have been looking forward to this game for months now. It's really frustrating. Please help. Thanks.