Hi,
Unfortunately, ASUS support site doesn't give out any drivers for that laptop for Windows 7 they only got drivers for Windows 10. What you can do is to download the driver from the manufacturer sites of each driver that you'll need.
Graphics card -
http://www.nvidia.com/Download/index.aspx
Intel chipset - https://downloadcenter.intel.com/
Touchpad - Either Synaptics or ELAN
Audio - Conexant Audio
LAN - Realtek
I would also suggest trying the Windows 10 drivers that may work, but haven't tried it yet.
https://www.asus.com/Notebooks/X756UJ/HelpDesk_Download/