I don't know whether this method has been posted before.
Just share this method I read from a Taiwan forum. I followed the steps and successfully installed the driver (Win7 x64).
To install the latest Nvidia Driver (The latest one: 197.16, released on 29Mar):
Things to prepared:
From ASUS website:
VGA Patch V1.0.0.1, original VGA driver (V8.15.11.8688), BIOS 210
From Nvidia driver download page:
The latest driver (currently it is 197.16)
Steps:
1.Update the BIOS to 210
2.Uninstall all the Nvidia Drivers and Display Control Panel
3.Install the VGA Patch V1.0.0.1
4.Unzip the original VGA driver (V8.15.11.8688).
5.Unzip also the latest Nvidia driver, copy all the files to the "Display" folder in the location where the original VGA driver (V8.15.11.8688) is unzipped.
6. Install the modified driver. (The setup.exe in the main directory of the extracted ASUS driver)