I think you need to install the East Asian languages in your Regional and Language Options.
Go to your control panel, click on regional and language options, then click the language tab. Check the "Install East Asian Languages" box. You may need your windows install CDs for this, I'm not sure.
Edit:
Looks like you probably won't need your CDs.
Edited, Jan 8th 2009 5:39pm by TirithRR
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