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Alot of times you can go into the properties of your wireless card and clear from the list all the access points you have connected to recently and in the past and it will help.Also check to be sure the wireless card is turned on.I've found that internal wireless cards tend to fail after a while due to heat and use.I would replace the card if clearing it of it's memory doesn't work.Also check to make sure that both antenna's are connected properly to the card in case they came loose.I tend to think the card is bad though.
There are a few things that can cause you to lose wireless connection with your wireless router. 1. Weak signal strength, check the signal strength on your wireless card. If it is weak move the wireless router away from brick or concrete walls and if possible locate the wireless router higher up. 2. Have you secured your wireless router from people near your from unauthorized access? i.e. change the default password, setup encryption use WPA2 or WPA, change the default SSID, and turn off SSID broadcast, and for added protection, enable MAC address filtering which allows only the MAC address/es of your wireless card/s to connect to your wireless router. 3. You could be getting interference from electrical sources such as air conditioners, arc welders, washing machines etc. If so, the power supply to the wireless routers and computers etc should be connected to a surge protection power board, better still connect your computer equipment to an UPS (Uninterrupted Power Supply). 4. Check the channels of the wireless routers and access points in your area and change the broadcast channel on your wireless router to an unused channel or one that is currently used but has the weakest signal strength. This will minimize interference with your wireless router from other wireless routers and access points in your area.
You may need to enable the wirless function or radio. It should show picture on the top keys. I think its press the function key and the wireless key. Fail that connect via ethernet and download drivers....
Some laptops have a button to "disable" the wireless adapter.
Click Control Panel
Click Classic View
Click Network Connections
Check that the wireless adapter is "enabled".
Right-mouse-button click on the icon for the wireless adapter,
and then click "repair".
HI Boston I believe the wireless card that you have in your laptop is a dell wireless card.
Here are the instructions on how to get your wireless working Start-All programs-dell wireless-dell wireless wlan card utility-open the window and on the uncheck let this tool manage your wireless. Please make sure that Enable radio is checked otherwise no wireless networks will be detected by the computer. Once that is done go to start control panel in the left hand side make sure classic view is what is there. Go to network connection and you would see wireless network connection. Right click and click on view available wireless networks. click on refresh network list if any of the networks are not seen. Still no go try to enable the radio of your wireless card by pressing fn+F2 and then try.
if your getting limited or connectivity right click on wireless network connection go to properties, select on the top the tab wireless networks and remove your network from the preferred networks click on ok.
now get back to view available networks and try to connect to your wireless network.
make sure if there is a security on ur network you are aware of the ntework key and its case senstiive as well. otherwise ask linksys to give it to u.
if your wireless says connected check the ip address and post it here . for finding ip address start-run-cmd-click on ok
in the command window type ipconfig and post the ip address here.
alternatively also try updating the wirless card from the site http://support.dell.com thank you do post your results and feedbacks if any