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• tap the windows button and type “cmd”, then click on “command prompt”
  This will open the command prompt

• In 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.

You can also delete ALL wifi profiles

netsh wlan delete profile na