I'm no expert but first you need to make sure the wireless is turned on. there will be a switch on your laptop. mine makes a blue light come on, but if it gets knocked off (courtesy of my son, usually) the light goes amber.
failing that, my daughter had a new Packard Bell laptop that did exactly what yours is doing, and there was a problem with the wireless card. it had to go back for repair, and Currys returned it in exactly the same condition. eventually they replaced it with a new laptop.