Maybe it's caused by the limitation of the Edition of your Operation System, since some edition doesn't have that function.
Edition
Home Basic
Home Preninum
Business
Enterprise
Ultimate
Windows scan and fax
NO
YES
Try others way we support
Free tools and troubleshooting guides that can help you resolve your technical issues
Online agent can help you with your technical inquiry in real time interaction. (For Notebook/EPC only)
Reference material on operating procedures or new technology that can get you familiarized with ASUS products.