Figured it out! Follow these instructions (I'm hoping it is the same hehe).
Right-click on the language bar and click on "S
ettings..."
Then, you should see, under the "General" tab, the following:
Japanese (Japan)
Keyboard
•Microsoft IME
Click on "Microsoft IME", then click on "Properties..."
Under the first tab, at the very bottom, click where this picture shows:
From that menu, either choose the very top item or 英語 (for English).
Then click on Apply, and OK. Let me know if this works for you.
Yours might be slightly different than mine since I am running Windows 7, but look for what I mentioned above.