Windows Vista Speech Recognition has Vulnerabilities.

I was working on the internet with the Speech Recog service running
but in Sleep mode (not listening ) and someone could take over my
screen & attempt looking thru my files. This happened a few times
untill I figured there was no intrusion happening if the speech
recognition was completely off.

Is there a way to make it secure. or any preference or a setting that
could protect my system?

Thanks to Ray Kurzweil & Microsoft for this technology, now its
somebody else's turn to make it secure.