Insane AI

Playing as Sewden I just finished dealing with Norway,when Hannover decided to declare war on me,bringing what seemed like half the known world in with it,as the AI is determined not to ally with me,under any circumstances. Still is when I'm at war with Russian and Poland/Lithuania,so my armies are stretched a bit thin at the moment. Is there a mod that makes the AI not declare war out of the blue like this? I know the game is Total war,but fighting multiple countries on 3 fronts is a bit tricky I'm finding. I did try Darth Mod but it doesn't appear to like Steam as it was giving me multiple error messages on startup