Did you install the Intel® Dual Band Wireless-AC 7260 or has it come already installed in your computer when you bought it?
It was already installed when I bought it
Since this wireless card came already installed when you bought this computer, the best option would be to get the drivers from the OEM (Original Equipment Manufacturer) support page.. The drivers found in our web site are generic and thus may not meet the requirements of your system as ASUS did modifications to the card to fit their system. Please, check and see if this link helps you to resolve the issue: Notebooks & Ultrabooks - N550JK - ASUS or contact them directly.
Let us know if this information helped you.