This is the page for ASUS users: http://www.asus.com/Notebooks_Ultrabooks/G771JM/HelpDesk_Download/ (VGA Section) Which is the version .337.
Here is a brief discussion on ASUS drivers vs Nvidia drivers:
I know when I first booted up DAI on my PC I also got the error code about updating my Nvidia drivers, and I am on Win7, so it is not just 8.1. Unfortunately, DAI has some software check on startup and it won't let you play unless you are on a minimum drivers version. First time I've seen that, but there it is.
So if you want to play DAI on that lap top, you are going to have to try the Nvidia drivers. From the few discussions I could find on the web, it seems either the Nvidia drivers won't even install, or tend to run fine. in that thread above someone who worked for ASUS mentioned stability issues though with other drivers than Nvidia. But it is either potential issues (unlikely) or no game, so it is up to you.
