Try the following:
Control panel>Regional and Language Option>Language (tab)>Detail>
The window named "Text service and input language" will come out. When you click "Key setting" in the settings tab, you'll see the window named "Advanced key setting".
You should find your key settings for input language in the window.
▼Toshiさん:
>I use Toshiba laptop at home.
>Today I did something and change the keybord setting to Japanes.(if I type "k" it's show "NO" in Japanese)
>Please someone tell me how to change back to English keyborad setting to type Japanese.