Assassin’s Creed III problem

So I am asking this here because I could'nt fint any good answers on other forums. So basicaly, on the first level of sequence 4 (the hide and seek mission) I experience a crash within the first 20 seconds of playing and I do not know what to do. I used every fix I found on the internet, including underclocking my gpu and cpu. After 5 hours of trying to fix it I feel like my heart is broken. This is by far the game with the most technical issues in the series.

Any Idea how to fix it before I lose my mind :( ?

SOLVED

It was a bug with the eagle view. If I were to use it, the game would crash within 20 seconds.