Why is my computer not responding to voice commands?

Check your microphone – Ensure that your microphone is properly plugged into your computer and that it is enabled in the Sound Control Panel.
Adjust your voice settings – Make sure that the voice recognition settings in your system are set to the right level for your microphone.
Update your voice recognition software – Make sure you are running the latest version of the voice recognition software.
Train your microphone – Train your microphone by speaking a few lines aloud so that the computer can adapt to your voice.