I have need to write an application which uses a speech recognition engine -- either the built in vista one, or a third party one -- that can display a word or phrase, and recognise when the user reads it (or an approximation of it). I also need to be able to switch quickly between languages, without changing the language of the operating system.

The users will be using the system for very short periods. The application needs to work without the requirement of first training the recognition engine to the users' voices.

It would also be fantastic if this could work on Windows XP or lesser versions of Windows Vista.

Optionally, the system needs to be able to read information on the screen back to the user, in the user's selected language. I can work around this specification using pre-recorded voice-overs, but the preferred method would be to use a text-to-speech engine.

Can anyone recommend something for me?