You need to install new OS on your notebook with English version of the OS if you bought your notebook from japan or your OS version installed is Japanese.
Hope that gives you an idea...
If you are using windows then
Open Regional and Language Options by clicking the Start button , clickingControl Panel, clicking Clock, Language, and Region, and then clicking Regional and Language Options. Click the Keyboards and Languages tab. Under Display language, choose a language from the list, and then click OK.
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