This is a pretty common problem. But it can be solved by following some easy steps.
Open the Control Panel.
In the search bar on your desktop, type Control Panel, and then click on Control Panel.
Then Open Network and Sharing Center, that is open to the public.
Change the adapter settings by going to Change adapter settings…
Activate your WiFi connection.
Alternatively, you can re-enable your WiFi connection.
Your Dell laptop should be restarted to check if it works or not.