Hi,
Do other software on the PC recognize the Chinese language on this PC?
I would suggest you to remove the language pack and install it again.
Refer to this article: http://windows.microsoft.com/en-in/windows-8/add-language-keyboard
Also, please note, Speech Recognition is only available for the following languages: English (United States and United Kingdom), French, German, Japanese, Mandarin (Chinese Simplified and Chinese Traditional), and Spanish.
Let us know if it helps. If the issue perists, please reply, we will be happy to assist you further.