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1) Using Applocale
AppLocale is preferable to switching Windows regional settings to Japanese as it allows you to run an application with Japanese regional settings without having to reboot and avoids issues such as Windows erroneously displaying other non-English characters as Japanese or certain applications defaulting to Japanese language.
You can download Microsoft AppLocale here: https://www.microsoft.com/en-us/download/details.aspx?id=13209
2) Changing Regional Settings
Go to Control Panel > Clock, Language, and Region > Regional and Language Options.
Then click the Administrative tab > Language for non-Unicode programs (System Locale) > Change system locale, select Japanese and then click OK.
You’ll be prompted to restart your computer.
More detailed instructions can be found here: http://windows.microsoft.com/en-US/windows-vista/Change-the-system-locale
Windows Vista/7 users also have the option of installing the language pack and switching regional settings. Windows 7 Ultimate users can switch regions altogether as well.