Speakers on the computer may or may not be out, plugging headphones in still works.
Parents were watching a show on hulu and discovered the sound was very faint so it sounded like they ran into the vista sound issue. Unfortunately, my dad is kind of the compulsive type and beat me to trying to do one of the more needlessly complicated solutions. Told them all that needed to be done is restart the computer to get it working most of the time. I'm fine using headphones though.