So ive had civ 4 installed for awhile and never had a problem. My last game, standard map with tons of units I blue-screened near the end. Loaded game and finished, game was slow because of the size/units. I tried a few new maps after, launched game and then entered worldbuilder to see what they looked like (fantasy, arborium), my game is now super super slow, even on the opening turns. Any Ideas?