Help:Multilingual support (East Asian)

Throughout , Chinese, Japanese, Korean, and Vietnamese characters (CJKV characters) are used in relevant articles.

Computers with older operating systems with the default language set to English or other Western or Cyrillic language settings will require some setup and proper fonts (See also: List of CJK fonts) to be able to display the characters.

Newer computer operating systems may not require any additional steps to view most CJKV characters.

If you see boxes, question marks, or meaningless letters mixing into the first part, you do not have full support for East Asian characters.

In order to display Asian characters in your browser, download and install the Microsoft Global Input Method Editors (IMEs) of the language(s) that you need (make sure to select "with Language Pack"). This is the system extension that provides the language support to your English Windows system when you are using Internet Explorer. Select the "with language pack" option if you do not have any related character set on your machine. The IMEs allow you to input CJK, while the language pack is the character set that you need to display the particular language. If you are an Office XP user, the Global IMEs will not work for you; you will need to install a new version of the IMEs for Office XP users.

Sometimes the system offers to download Asian fonts by default while viewing pages in those languages. Otherwise, update your system manually with these language support packs.

Windows XP and Server 2003 include native support for East Asian languages. To install the files, check the Install files for East Asian languages in the Control Panel > Regional and Language Options > Languages. Note that a minimum of 230 MB of disk space is required and that the Windows CD-ROM is needed while installing support for East Asian languages using this method. (Non-East Asian localizations only)

...
Wikipedia