If your computer’s os is XP then do the following steps. I found this from Microsoft web.
The setps are really the same action that I told you in the previous comment but the window’s name and other botton’s name are different from Windows Vista.
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Windows XP
To install another language and keyboard layout in Windows XP, follow these steps:
In the Windows XP standard Start menu, click Start, and then click Control Panel.
In the Windows XP classic Start menu, click Start, click Settings, and then click Control Panel.
Double-click Regional and Language Options.
Click the Languages tab, and then click Details under "Text Services and Input Languages".
Click Add under "Installed Services", and then click the language you want to add and the keyboard layout you want to use for that language.
To configure the settings for the Language bar, click Language Bar under "Preferences".
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REFERENCES
With the LangPack installed, Internet Explorer 4.0 users can install and use the Japanese/Korean Input Method Editor (IME) for Windows 95 and Windows NT 4.0. This will allow users to not just display but also input Japanese and Korean text into Web forms and Outlook Express 4.0 e-mail messages. For more information, please see the following Microsoft Knowledge Base article:
186113 (
http://support.microsoft.com/kb/186113/EN-US/ ) Internet Explorer Input Method Editor 4.0 for Japanese/Korean
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The web page thatI found is
http://support.microsoft.com/kb/177561
Also, I forgot to mention how to view Japanese text in the web page. Go to "View" on the Exploer’s menu bar, then "Encoding" choose either "Japanese (Auto-select) or Japanese (EUC). You might click "More..." from "Encoding" to see those options.