为何我在网吧玩的极品飞车9是中文的，但拷贝到我家电脑上来就变成了英文？

这是由于你只拷贝游戏安装目录文件，未将注册表中的信息拷贝回来，汉化程序在系统中找不到游戏造成的，解决办法是用记事本新建一个文件，输入如下内容：
Windows Registry Editor Version 5.00

[HKEY_LOCAL_MACHINE\SOFTWARE\EA GAMES]

[HKEY_LOCAL_MACHINE\SOFTWARE\EA GAMES\Need For Speed Most Wanted]
"DisplayName"="Need For Speed Most Wanted"
"Installed From"="G:\\"
"Registration"="SOFTWARE\\Electronic Arts\\EA GAMES\\Need For Speed Most Wanted\\ergc"
"CacheSize"="3118494720"
"SwapSize"="0"
"Language"="Chinese (Traditional)"
"Locale"="zh_tw"
"CD Drive"="G:\\"
"Install Dir"="d:\\极品飞~1\\"
"Product GUID"="{9F16A9FF-3784-4F73-0082-2182D5A93311}"
"Region"="ZH-TW"

"Suppression Exe"=""
"VERSION"=dword:00000001
"SIZE"=dword:00000084
"g_CarEnvironmentMapEnable"=dword:00000000
"g_CarEnvironmentMapUpdateData"=dword:00000000
"g_RoadReflectionEnable"=dword:00000000
"g_MotionBlurEnable"=dword:00000001
"g_ParticleSystemEnable"=dword:00000001
"g_WorldLodLevel"=dword:00000001
"g_CarLodLevel"=dword:00000000
"g_OverBrightEnable"=dword:00000000
"g_FSAALevel"=dword:00000000
"g_RainEnable"=dword:00000000
"g_TextureFiltering"=dword:00000000
"g_RacingResolution"=dword:00000000
"FirstTime"=dword:00000000
"g_PerformanceLevel"=dword:00000002
"g_VSyncOn"=dword:00000000
"g_ShadowDetail"=dword:00000000
"g_VisualTreatment"=dword:00000000

[HKEY_LOCAL_MACHINE\SOFTWARE\EA GAMES\Need For Speed Most Wanted\1.0]
"Language"=dword:00000012
"DisplayName"="Need For Speed Most Wanted"
"LanguageName"="Chinese (Traditional)"
保存为reg文件，然后放在极品9的安装目录下，双击导入注册表，应该就可以重新恢复成中文版的

那是因为网吧的是汉化过的，设置存在于注册表和系统中，你拷的只是游戏本身而已

自己现在一个《中文补丁》吧

下载汉化补丁就OK了