Starting Civ 4 (with up to date patch) is no problem - the game runs fine
. If I save a game and try to reload it, I get the following error:
Failed to Allocate Video Memory - Please try reducing your graphics settings.
I have tried going to 16 bit and 800x600 resolution - I think that is what this message means, but it does not help.
Any ideas?

Failed to Allocate Video Memory - Please try reducing your graphics settings.
I have tried going to 16 bit and 800x600 resolution - I think that is what this message means, but it does not help.
Any ideas?