For viewing Chinese characters on a web page, all you need is to
have the required font files within your computer and your browser
should auto-detect the encoding of the web page and display it
accordingly.
For viewing them on other applications, you may need to adjust
some settings on your computer. Go to Start > Control Panel >
Date, Time, Language and Regional Options > Regional and
Language Options > Advanced, under the Language for non-Unicode
programs, set it to Chinese (PRC).
And if you don't find anything related to the Chinese language
under the choices of input methods, it's most probably that it is
not installed. Try checking the boxes under the Supplemental
language support and they should prompt you to insert the Windows
XP disc in order to install the necessary files once you click on
the OK button.