If something goes wrong, get the newest code and reinstall. Make sure you read the README file and regularly update to fix errors and get new features.
Install instructions:sudo apt-get install git-core
git clone git://github.com/StevenHickson/PiAUISuite.git
Voicecommand setup instructions:voicecommand -s
If you've watched the videos and read the posts and read the README and something still doesn't work, feel free to contact me and ask questions.
Consider donating to further my tinkering since I do all this and help people out for free.