|If you just want the icon back, start>>connect to>>show all connections. After that right-click your wireless connection, and check Show icon in notification in area when connected|
Or if your driver isnt detected, like you cant use the network, then i suggest you verify that you have got a copy of your wireless driver, then goto my computer(right-click)>>Manage. Select your wireless driver and click uninstall (on the top). After uninstalling, restart the computer and then re-install from the original driver. Restart again before trying to use it..