well try this step go to the device manager .go to network adapter right click on the dell wireless card . uninstall it. restart the computer. you will get the message found new hardware. then try configuring the wireless connection. tell me one thing are you making use of windows configuration if yes try using the wireless card utility. for this first disable the wireless zero configuration.for this you need to right click on the my computer left click on manage.left click on service and application.

left click on services . scroll down through the lsit of service look for the service called wireless zero configuration right click on it left click on properties make the service status type stop.

click on ok.

go to all programs look for dell wireless. check for the dell wireless card utility. make sure the enable radio is checked. make sure  let this tool manage the wireless settings should be checked

.cheked for the avalable networks. under preferd network it will will be blank. hight light you network under available network click on configure.under the properties windows make sure the encryption should be WEP. uncheck the key is provided to me automatically.

under the netwok box enter the network key.

confirm the key.

click on ok.now check for the internet connection if its working. then go ahead and restart the computer.

once the computer restarts check for the wireless conmnection.