Most laptop computer these days comes with a building wireless card; some required you to switch on the Wireless Radio Antenna via a small slide switch on the laptop
Or using the FN (Function) key you have to hold down the FN key and press the key with a small antenna icon to turn on the wireless card Antenna
Check that the wireless card is Enable/Disable from inside the Network Connection Area
Start-Setting-Network Connection-Right click-Wireless Area Connection-Enable or Disable as required
Some times you have to Disable and Enable before the card will connect to the wireless system
If not sure if laptop have a antenna switch check the manual PC layout quick guide
Check out these site before you setup the wireless system could save you a lot of time and headache.