After you run the OOBE wizard, Lpksetup.exe automatically removes the unused language packs. When it removes language packs, Lpksetup.exe compares language names instead of language codes. If a removed language and the current system language have the same language name, the current system language pack is also removed. For example, ZH-TW and ZH-HK share the name “Chinese”
Please refer to the Microsoft KB: http://support.microsoft.com/kb/977911
Please refer to the following steps to solve the problem.
1. Restart the system
2. Type ‘regedit' to enter Registry Editor
3. Select the HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\MUI\UILanguages\, and check if the language you use is in the list or not.
4. If the language you use is in the list, please delete other languages ( Using zh-TW as an example, if you can find zh-TW, then delete en-US, pt-BR, pt-PT and th-TH).
5. If your language is not in the list, please download the system language package from the following link.
Notice: the language packages for 32/64 bit OS are different.
Chinese (Traditional, Hong Kong S.A.R)
Chinese (Traditional, Taiwan)
6.The problem will be solved after restart the computer.