A memo of the procedure to localize Windows7 English version to Japanese.

1. Open "Region and Language"
4. Open the "Administrative" tab, and in "Language for non-Unicode programs", change "Current language for non-Unicode programs:" to "Japanese (Japan)"

That’s it.

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Reference Information

・英語版のWindows7の入ったコンピューターを日本語化する - マイクロソフト コミュニティ

That’s all from the Gemba.