I suppose you'll need to install the necessary language support
into Windows.
Go to Start > Control Panel ( > Date, Time, Language and
Regional Options ) > Regional and Language Options >
Languages tab
Under Supplemental Language Support section, tick both. They may
need you to follow certain installation instructions which would
require you to have a XP CD at hand.
Within the same tab and above that section, there's a Details...
button. Click that and there will be another window. Go to the
Advanced tab and click on the checkbox within the Configuration
Compatibility section.
For anyone else who wish to type Chinese
characters, you'll need to set the text input options accordingly
under the Settings tab of the same "Text Services and Input
Languages" window.