That happened to me too. Then I realized I inadvertently hit a button at the top left that has an image of an antenna which toggles the wireless connection on and off. Try hitting that and see if it fixes your problem.
It seems that you have a problem with your network connectivity. Try to connect manually after switching off wifi adapter on your laptop and reset your router for few minutes at least otherwise It would be a good idea to perform a network test using www.netscan.co and click on the green button "Start network scan!". You will receive a unique URL which you can share with us so we can help.