Many of us have to accept the fact that the original Shogun: Total War just isn't playable for us. The newer generation nvidia cards all seem to throw fits when it comes time to fight a battle, and for some people, cause nothing but headaches and frustrations. Various work arounds and fixes have cropped up over the years, and now another to try looks particularly promising.
If you're absolutely dying to get a chance to play the original Shogun and are plagued by problems, take a look at the following thread:
https://forums.totalwar.org/vb/showth...x-Nvidia-Cards
And good luck! If you're one of the many people (like myself) who suffers from this problem, here's hoping this fix is the one that finally does the job. Some users have already reported this method working for them, so it may be worth a go.