You are getting the same error that everyone had for not changing their System locale to Taiwan, even if you say you did it already, try it again you most have done something wrong.
App locale is built into Windows Vista, heres how to get to it/run it.
***NOTE***This changes the Language in which programs are installed and ran (However it will not change your computer language) make sure you have installed the language you need for the locale from Windows Update before changing your locale.
Step 1. Go to Control Panel and click on “Regional and language options” or (if on Category view) “Clock Language and Region” and then “Regional and language options”.
Step 2. Click on administrative tab in the Regional settings.
Step 3. choose your Locale (which is simplified chinese,which should look similar --> 简体中文)
DONE.
( I grabbed this off of google with a little bit of searching and edited to you're situation ^^)
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