Your ultrabook has dual graphics. You should be getting the drivers from ASUS, as they may have modified/customized the drivers specifically for their device.
Using the Intel generic driver may cause problems and/or a lack of functionality.
That said, you can find the latest driver here:
https://downloadcenter.intel.com/download/27417/?product=65714 Download Intel® Graphics Driver for Windows* [15.33]
I would suggest to do a clean instalation of win10 by downloading latest iso.
After that upgrade bios https://www.asus.com/Laptops/S56CB/HelpDesk_Download/ S56CB Driver & Tools | Laptops | ASUS Global
After that run few update cycles and laptop will pull whql driver from windows update for hd4000 and nv635 card