Pyttsx not saying all text when using non default voice

Question

I created a small module to speak the text that is sent to it. It works fine if I don't use engine.setProperty to set the voice, but if I set the voice it will only play the first command.

import pyttsx


def speak( text ):
    if text != "":
        engine = pyttsx.init()
        engine.setProperty('voice', "HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Speech\Voices\Tokens\VW Kate")#if I don't do this line then it says both the commands
        engine.say( text )
        engine.runAndWait()

    else:
        print "you didnt enter anything"


if __name__ == "__main__":
    speak("Hello")
    speak("This one won't play unless I use the default voice")