crashing

Hello , I just got a medieval Total war Copy from my Friend and installed it , now the problem is that when i am playing it the Game Suddenly Crashes in the middle of the Play and it Left me really Annoying , Can you tell me Why this game Crashed and how can i solve this problem , also the game seem to be in the Russian language , can you tell me how can i convert the Russian language to English , please help me thanks in advance
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