I agree. Navdy should round up all the people in Werner Herzog's texting documentary, ask them to endorse their product, and post that video on their website.
From The Wikipedia entry on mobile phones and driving: "The NHTSA considers distracted driving to include some of the following as distractions: other occupants in the car, eating, drinking, smoking, adjusting radio, adjusting environmental control, reaching for object in car, and cell phone use."
When I was a kid and my dad was driving and had to make a left turn or perform some other maneuver that required his full attention, he'd ask everyone in the car to be quiet. This was a man that raced automobiles as a hobby and worked in professional racing at the highest levels his entire life.
The cost of the Windows license is partially offset by the crapware bundle the manufacture infects the machine with, so you won't save much buying a blank PC and your options will be severely limited. However, you may still be able to get a refund on the license post-purchase, if you're dedicated (and lucky):
