If Station Mode is the correct mode and the card is "Disconnected", this probably just means that you haven't gone through the procedure to "Connect" to your wireless network (Router). How you do this varies between different versions of Windows.
Essentially, the PC needs to scan for Available Wireless Networks from which you select the one which matches the SSID (network name) of your Router. You then select the option to "Connect" to that network which, if secured by WEP/WPA/WPA2 encryption, will prompt you to enter the encryption key. Once entered, you should connect and have network and internet access.