Hi i have a problem with civ 3 conquests you see my display the loading screen and the in game screen you see the picture is all choppy and some options will close the game and there are pictures of the leaders all over the place and in order for me to end my turn is for me to hold the spacebar so please help

sounds like a corrupted install.

Uninstall, reinstall.

If you're trying to use a graphics mod, make sure all the files are changed to what they should be.