Then it looks like you can't get to the Gateway, which means either the Gateway is bad or the Wi-Fi card is bad. A bad Wi-Fi card should show some indications on your system.
I can only see three possibilities. Reset the Wi-Fi card and reinstall all drivers which you have done. Replace the Wi-fi card or get an external one with which you could test. Lastly, which may not be easy, is replace your Gateway or at least check for firmware updates for it. If it is an ISP supplied device, they might be able to check it or provide firmware/replacement.
I am assuming all lights on your Gateway are indicating normally.
If you could try a wired connection that might give some info regarding the gateway operation but might not help on the Wireless front.