​I came across a Chinese KB that I translated and it basically says if you are having issues installing the CHT version of IE9, to try the ZHH IE9 Language Pack after installing Win7 SP1 language packs\language interface packs (ZH-HK, ZH-CN, and VI).  It appears ZH-TW may have been removed from the language packs according to my initial blog\technet readings.

 
KB Reference Article ID: 2,528,543
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If you are a 64-bit Windows 7 users, find the

[IE9-Windows6.1-LanguagePack-x64-cht.msu], and click next to the
[Download] button to download and install Internet Explorer 9 Traditional Chinese Language Pack; If you do not know how to tell if you are 32 / 64 bit users, please visit this article

 

[More Information] [How to determine in your computer is running a 32-bit version or 64-bit versions of Windows operating systems]; If you can not correctly installed, or restart after installing the English version, or if 32-bit users try to download and install [IE9-Windows6.1-LanguagePack-x86-zhh.msu], 64-bit users try to download and install [IE9-Windows6.1-LanguagePack-x64-zhh.msu], and in the control panel, verify that your current display language for Windows 7 Traditional Chinese

 

System Center 2012 Configuration Manager, ConfigMgr, SCCM