Can't display using Panasonic projector

I'm running Bootcamp on a MacBook Pro (Windows 7 Pro). I'm trying to display via VGA on a Panasonic PT-FW430, but the projection doesn't recognize my VGA connection. I've been able to use other projectors, and I've confirmed that a Windows PC can display without issue. Is this a driver issue? If yes, does anyone know which driver I need to update?