game crashes

I tried relaunching game from an earlier save. I made peace with one civ and was able to play for several more turns than I couldn't get past, but now it's freezing around turn 270. I thought it could be my laptop, so I saved the file off and loaded it onto my previous laptop, then updated...

Civ IV, BTS, Bug Mod, Noble, me vs PC, PC, Windows 10. My game has started crashing due to two messages coming up prior to the crash. Sometimes it crashes on its own, it always crashes when I Click on a particular Civilization to have a trade etc. This shows up during the start process: It...