I was playing the 3rd mission on Campaign.
During the game play, I tried to take a planet and the windows reported error and shut the program down. It kept doing that every time I reload and try to take the planet. So I just skipped it and everything went fine for a while.
After 20+ turns when I press end turn button, the game shuts down again so I have no way of advancing the campaign further.
Vista 32bit
6600GT
2.6Ghz AMD X2
2G Ram