Every network device has a discrete MAC number. It is either written on it, or you can find it by opening a cmd window (Start - Run - cmd) and typing ipconfig /all The MAC address is listed as the Physical Address and is in the format xx-xx-xx-xx-xx-xx where x can be a number or the letters A - F. Your router may have a facility for restricting the wireless adapters that can get IP addresses to those you list (mine is under Firewall as MAC Address Filtering). Enter the MAC addresses of ALL the adapters in your system - outsiders will not then be able to join your network.
Just a thought - Is the wireless device switched on? It must be enabled in Network Connections and there may be either a physical switch on the laptop or a combination of the Fn key and one of the Function Keys to switch it on.
The netwrok is displayed in the 'view wireless network connections' window, but when I click on connect it tries for an age and then says not connected, but the 'connect' button at the bottom says disconnect... weird
I know that the wifi card works as I have used it on other networks. I have also made sure that the filtering is off so that any computer can connect as long as it has the WEP codes (which I do)