Is the 5Ghz turned off on the router? Can you login to the backend of router and turn it on?
Many of my customers have had this turned off and once turned back on, it as resolved the issues.
Press Windows Key > Search Device manager > Open Device manager > Find the WiFi Driver > Right Click and Uninstall.
At the top click the Scan for Hardware Changes and it should re install. If not then the WiFi card is caput.
Edit: Just seen you can connect to other WiFi. Do you know the...