webworkings :
Try on a different WiFi network. If you still can't get connected then I would try connecting via Ethernet.
In the end, you will probably need a new WiFi card. You then have the option of replacing the internal one or getting an external one, that connects via USB.
This is far from "Best solution", @ErAnkurPaul. In fact, who said it's even a solution? Not OP. Who's monitoring this? Replacing hardware without testing is NO SOLUTION.
Terrible advice without further troubleshooting. Something about the Intel drivers could be amiss. Shut down, power off [Is this truly necessary? Why not; it may be hardware related], and restart?
Go to Control Panel > System > Device Manager and look under Network Adapters.
Is your adapter listed?
* If so, right-click it and click Properties. Does the Device status box say "This device is working properly". That speaks for itself. Repeat for anything whose name resembles that of your adapter (like "Intel WiFi adapter....").
* If NOT, look for its name as its own entry in the list. If not there either, maybe you DO have bad adapter. Maybe.
At this very time, I'm using the internet successfully, wirelessly, despite the message "No supported Intel Wireless adapter is found." Fifteen minutes ago, it was there, but Disabled and refusing to let me Enable it. Other days, it's Disabled but lets me Enable it. Meantime, I'd done nothing. Crazy. I don't really know what might be missing or wrong. Bugs in Intel software, no doubt. But no updates available. Maybe Dell's problem.
I only need it to be Enabled today to try to link my wireless earbuds to the computer. Whatever. Using my phone.
Just don't run out and get a new wireless adapter just yet.