Welcome to Seven Forums,
I'd usually download the driver from the Atheros site
then manually install the driver. This tutorial
might be of helped for you to manually install the driver.
Also, please install and run Xirrus Wi-Fi Inspector
from your computer. Double click the Xirrus Icon on his laptop's desktop, Tap the Printscreen key on your keyboard, open up Paint then choose Edit from the Menu and select Paste, then SAVE it. Upload and attached the file here.