I went into Civ4 folder and found the configure file.. something like _civ4config.
Then scroll down to find a line that says "set to 1 for no in game movies"
Then I changed the next line to "no movies =1" If you ever want to turn the movies back on then change the 1 to a 0.
I had to turn the movies off so the game wouldnt crash. I seen a half dozen of them and thats about all I needed. then it started crashing every movie. I wouldve turned them off eventually after I seen them all anyways, just to keep the game running faster. After I did above steps, the intro movie and alll in game movies quit playing and I havent had a crash since.
Thanx Myartar for all the other edits. Ive been meaning to turn off auto save as well. Now I will