I had this problem on my new G73JW. Followed the automated Asus Live Update, downloading and installing one update at a time.
One of these was the new video drivers: it "installed" the drivers, rebooted but clearly didn't install sucessfully: Windows (7 64) booted with a generic VGA adaptor, in a low resolution like 640x480. nVidia control panel was gone, and in display settings I could only take the resolution up to about 1280x760 rather than the native 1080p resolution normall supported.
I solved it by restoring my system to the most recent system restore point. Restored to original drivers with no problems. I then went to the ASUS website, and in the support section downloaded the most recent drivers for my model there. These installed without problems, although the icon for the nVidia PhysX (32-bit) seems to have gone in the control panel?? But the PhysX settings are still accessible in the nVidia control panel (not that I really have need for them at present) so all good.
There's clearly something fishy about the Asus Live Update software, and I recommend people only use it to be alerted to new updates, but then take themselves to the ASUS website and manually install them. I think ASUS needs to look at this software - for us reasonably proficient computer users, it's ok to deal with these problems occasionally, we can work our way round them; but for the average Joe-Schmoe user, who just forked out thousands for their high end machine, followed the official ASUS instructions, and suddenly finds their computer "ruined," it's not a great look for the company. An update should not be issued without careful testing, including of the install process.
Oh, and remember to set regular System Restore points - it really is a pretty useful system, thanks Windows!
