This article describes how the Windows Speech Recognition language must be the same as the operating system language in Windows Vista.
Windows Speech Recognition is available only when the language of the operating system matches the language of Windows Speech Recognition. In Windows Vista Ultimate, you can change the language of the operating system by installing a language pack from Windows Update. If you install the language pack of a supported Windows Speech Recognition language, you can then use Windows Speech Recognition for that language if that is also the language of the operating system.
Windows Speech Recognition supports the following languages:
For more information about Windows Speech Recognition, click the following article number to view the article in the Microsoft Knowledge Base:
928313 The user interface items are not in the correct language when you open the "Speech Recognition Options" Control Panel item in some versions of Windows Vista