You can set the LANGUAGE environment variable to en_US.UTF-8 either for the current user or globally using Control Panel → All Control Panel Items → System → Advanced system settings → Advanced → Environment variables , create a new variable in User or System .
Once created, your changes will only apply to new instances of cmd or other programs.
Note that LANGUAGE env seems to be. a variable is not something that most other programs pay attention to, with the exception of hg or TortoiseHg . I was able to install it in my Windows 7 window (English) and set LANGUAGE=de_DE.UTF-8 . This changed hg to report most messages in German, but it didn’t affect any of my programs - they still speak English.
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