Locate your wireless card compartment on your computer. It is probably on the back of it. Your computer manual should tell you where it is. Open the compartment and locate your wlan card. Remove it from your laptop for about 30 seconds, and then reinsert it and make sure that the proper connections to it are firm and secure. Close up the compartment. Turn on your laptop. Your laptop should search and recognize it. If it doesn't, then your wireless card probably quit working on you. If your computer is still under warranty, and if it doesn't recognize it after you have tried this, then you can contact your computer manufacturer and explain to them what happened. They should replace your wireless card at no charge. If you bought the wireless card from some other store, then take it to them and explain to them, and ask for a replacement wireless card.