Sometimes the login credentials for wifi get corrupted. This is especially true if the wrong password is ever entered, or if the laptop is logged into by more than one person. There are two methods. The first is easiest, but not as reliable. The second is ‘more techie' but more likely to fix the issue.
Method one:
Click on the wifi symbol as you would to connect to a wifi signal.
Right click on “PBS” or “PBS Wifi” and choose “forget”
Method Two
tap the windows button and type “cmd”, then click on “command prompt”
This will open the command promptIn that command prompt type
netsh wlan show profiles
This will show a list of wifi’s that the laptop has connected to.
Look for the wifi that you are trying to connect to. (For example “PBS”)
Delete the wifi profile of the network you are trying to connect to using this command
netsh wlan delete profile name="network-name"
Where “network-name” is the name of the wifi you are trying to connect to.close the command prompt window and try again to connect to your wifi
You will have to re-enter your username and password or (in the case of home wifi) passcode.