我玩使命召唤2到美军时，为什么游戏会退出？

之前玩苏军和英军时都没有问题，玩到美军时在进入任务的途中突然退出游戏，并弹出如下信息：
WARNING: Could not find material '$levelbriefing'
Loading 'ui/background.menu'...
Loading 'ui/pregame.menu'...
Loading 'ui/victoryscreen.menu'...
-----------------------------------
Loading materials...
Loading sun settings...
Loading lightmaps...
2 merged lightmaps from 5 original lightmaps
Loading lightgrid coefficients...
Loading lightgrid hash...
Loading surfaces...
Loading cull groups...
Loading cull group indices...
Loading portal vertices...
Loading occluders...
Loading occluder indices...
Loading AABB trees...
Loading cells...
Loading portals...
Loading nodes and leafs...
Loading submodels...
Loading entities...
ERROR: Sound file 'sound/weapons/impact/mrk_impact_flesh21.wav' not found
ERROR: Sound file 'sound/weapons/impact/mrk_impact_flesh20c.wav' not found
ERROR: Sound file 'sound/weapons/impact/bullet_imp_plate02.wav' not found
ERROR: Sound file 'sound/weapons/impact/bullet_imp_plate04.wav' not found
ERROR: Sound file 'sound/weapons/impact/bullet_imp_plate05.wav' not found
recursive error after: Hunk_AllocateTempMemory: failed on 438333 bytes (total 200 MB, low 1 MB, high 198 MB), needs 227789 more hunk bytes

这是怎么回事，还请各位高手帮帮我。

是常见的问题..缺少文件..你的游戏已经损坏了.而且少了将近200M.不是正版的吧.
再下的话找个好资源吧

游戏安装的有问题 重新安装游戏