Go to the control panel and click "change keyboards or other inputs" under the clock, language and region section. Click on "change keyboards" then click "add" on the right hand side of the general tab. Then pick the Japanese heading and select the Japanese keyboard and pick okay. It should install.
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You can turn on the IME (input method editor) for the Japanese language in the Regional Options control panels.
BTW do you know the meaning of your user name? It is obscene.
Go to the control panel and click "change keyboards or other inputs" under the clock, language and region section. Click on "change keyboards" then click "add" on the right hand side of the general tab. Then pick the Japanese heading and select the Japanese keyboard and pick okay. It should install.