Windows OS offers a troubleshooter designed to resolve issues like this one. All you need to do is the following:
Note: Another way to access the troubleshooter is to right-click the network icon in the notification area (in the bottom right-hand corner of the screen) and then select Troubleshoot problems.
Maybe the Wi-Fi network you are trying to connect to is hidden. In order to connect to hidden networks, you need to enter the router's details (SSID and wi-fi password) manually.
There are two ways of connecting to hidden Wi-Fi networks:
Note: In the Security type field you need to choose the type of security used by the hidden wireless network, which can be found on the router's label on the bottom side, closely to the model number. Also, Windows may or may not ask you to also specify an encryption type, depending on the security type you choose. Please bear in mind that WPA 2 - Personal (or WPA 2 - PSK) is frequently and widely used these days.
Note: If you want to connect to this network automatically, check the check box next to Start this connection automatically. Also, you can check the check box next to Connect even if the network is not broadcasting.
Maybe the driver is out of date. All you need to do is to go to your device's manufacturer's website and download the latest drivers (see the don't know how to download and install drivers guide).
Alternatively, you can update the driver through the Device Manager:
Consider this as an option, especially if you reset your router and entered the same wireless network name (and password), but, before that, you were able to connect to that Wi-Fi network. You need to remove it from your computer's saved Wi-Fi passwords list, i.e. "forget" the network, and reconnect to it.
To delete saved networks, follow the steps below:
Note: If you use Windows 7, right click the Wi-Fi network icon in the bottom right-hand corner and click on Network and Sharing Center. Then, click on Manage wireless networks (on the left side of the window), select the network you want to "forget" and click the (-) remove button.
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