Hey, I had the same problem with the audio as it kept saying "no audio ouput device installed."

First uninstall the sound drive by going to device manager and click on sounds. Then click the device tab and click uninstall. Then restart your computer.

Then go to Sony eSupport - Electronics and click on software and ers. Then type in your model number and on the next page click "original". Then look for "SigmaTel® High Definition Audio CODEC" and download and run it. Then restart your computer and your audio will work fine.