Hello Dragula, and welcome to the Guild. Perhaps we will be able to help you. Sadly, once you've bought the game it can be difficult to get game publishers to help you. I could never get Battle Isle 2 to work and never heard from game support. Ah well,
CTD means Crash To Desktop, IE closing the game without warning or error message.
As you can play the battles but not the campaign, I suspect the campaign map. Try
1) Altering the solution of the campaign map in the options before starting a new game - try different sizes, though I belive 800 x 600 is the most propable resolution.
2) Anti-aliasing: Please check the manual of your video driver. Or wait for someone to show you pictures of how you force it to always use 2 x (its usually not that difficult once you've located the button)
3) Exchange of problematic files. Two .bif files sometimes causes problems for video cards. You can replace them with two from a mod - say Napoleonic Total War. The link is in the stickied topic. Sticky means it stays at the top of the forum even though the last post is a year old.
We hope you enjoy your stay,
/KotR
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