encontre los requisitos.... pero mantengo las preguntas del compañero Caz, hay para mas idiomas
Estos son los requerimientos:
Supported Operating Systems
Microsoft Windows XP Professional or Home Edition; all language versions.
Microsoft Windows 2000 all versions; all language versions.
Microsoft Windows Millennium Edition; all language versions.
Microsoft Windows 98 all versions; all language versions.
Microsoft Windows NT® 4.0 Workstation or Server, Service Pack 6a, English, Japanese, or Simplified Chinese versions.
Windows 95 or earlier is not supported.
Hardware Requirements
An Athlon64/Pentium4 or later processor at 1.7GHz; 512 megabytes (MB) of RAM is recommended.
A microphone or some other sound input device to receive the sound is required for speech recognition (SR). In general, the microphone should be a high quality device with built-in noise filters. The speech recognition rate is directly related to the quality of the input. The recognition rate will be significantly lower or perhaps even unacceptable with a poor microphone.
Not all sound cards or sound devices are supported by SAPI 5, even if the operating system supports them otherwise.