Software

see if either of these helps, if not comment and will search some more for an answer.

http://blogs.msdn.com/b/speak/archive/2010/07/29/faq-about-the-server-speech-platform.aspx

http://social.microsoft.com/Forums/is/speechserversoftwaresetup/thread/918f0fb6-ff6d-4f80-af17-f5f3e700f089

Have you installed the language pack?

I have installed

SpeechPlatformRuntime.msi
MSSpeech_SR_pt-BR_TELE.msi
MSSpeech_TTS_pt-BR_Heloisa.msi
MicrosoftSpeechPlatformSDK.msi

I tryed versions 10.0 and 11.0

I read the links but could not solve the problem yet...

Excuse me

In true your link solved the problem, but i did not realize

I expected that the engines appear at control panel and use then through SAPI5 in Dot Net at System.Speech

What happen is:

Is needed to install the Microsoft Speech Plataform SDK and make a reference to folder Assembly the file Microsoft.Speech.dll

Then the engines are avaliable at  Microsoft.Speech namespace not System.Speech namespace

Both namespaces are very similar and i do not know why this duplication

But this way I can use the engines...

Thanks