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The Dell Latitude E6400 laptop comes with an Intel Core 2 Duo processor for fast computing and an NVIDIA graphics card for video playback, gaming and Web browsing. The laptop has a built in Wi-Fi card, letting you connect to the Internet on-the-go. However, if you're unfamiliar with Dell or the laptop's factory installed Windows Vista operating system, you might not know how to enable to Wi-Fi.
Slide the switch on the side of the laptop toward the front of the laptop. This switch enables Wi-Fi connectivity on the Dell Latitude E6400. When switched into the back position, the Wi-Fi is turned off. Turn on your Dell Latitude E6400 laptop and log into Windows Vista. Click on the Windows "Start" button. Click on "Wireless," located in the Start menu's "Show" list. A list of currently broadcasting wireless networks appears on screen. With your Wi-Fi enabled, you can connect to any of these available networks. Secured networks ask you for a password when you click "Connect," while unsecured networks connect automatically.
its knows that vista isfull of bags and corraps.
the fing is a computer with vista req a heavy vid card such as 9xxx (dont go on 8800 it is waste of money) and you need 2-4 gb ram for your computer to work perfect and so the best fing you can do try to download windows7 beta it is like windows vista but acts like xp wich is the best so look for a good downloadand goodluck.
First check that you have got right adapter for your laptop.
then check that your motherboard actually supports a wi fi. IF you have everthing sorted then go ahead and plugin the compatible adapter. Also, be sure to have the latest driver installation disk ready.
Start your PC, it should detect it and then ask you for the driver.
If this dosen't work or you are unsure then my best advice is to take it to an authorised vendor and let him do it, no use playig around with an expensive laptop.
please note that there are 3 possible wireless network cards in this laptop, I sugest you download all, and try each in the following order
remember to uninstall each driver if it is not correct
If you are runing XP, you will need to try and locate the relevant 3 XP drivers from the 3 manufactures sites EG: Intel