下载的COD7安装不了，求助

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我把那个昨天下的英文版解压后，准备安装，出现下面的文字，我该怎么办啊？

it appears that call of duty:blackOps did not quit properly the last time it ran.do you want to run the game in safe mode?
this is recommended for most people.
it will change you system setting but not you controls