First of all, make sure Internet Explorer 6 is installed on your computer. When you go to the sites that have Japanese text, you should have been presented at some point or another to install a Japanese Language pack. I got this straight from IE's help files:
To correctly display Web pages encoded in any language
Most Web pages contain information that tells the browser what language encoding (the language and character set) to use.
If the page does not include that information, and you have the Language Encoding Auto-Select feature on, Internet Explorer can usually determine the appropriate language encoding.
To turn Auto-Select on
On the View menu in Internet Explorer, point to Encoding, and then make sure Auto-Select has a check mark. If it doesn't, select it. If you are prompted to download language support components, click Download.
If Auto-Select cannot determine the correct language encoding, and you know what language encoding it should be, you can manually select it.
To select the language encoding for a Web page
On the View menu, point to Encoding, point to More, and then click the appropriate language. If you are prompted to download language support components, click Download.
Notes
If the Auto-Select feature or a specific language pack is not installed on your computer, Internet Explorer prompts you to download the files as needed. Adding languages does not guarantee that your computer has a font that can display Web pages in your preferred languages. To be prompted when fonts need to be added, on the Tools menu, click Internet Options, click the Advanced tab, and then select the Enable Install On Demand check box. Or you can download a Multilanguage support pack to display pages in this language. You can add a Language Encoding button to your toolbar to make switching between languages quicker.
