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take the side of the computer off and look for the model number on your motherboard. you need to know if your using a network card or if its onboard Lan. if everything you need is onboard all you need to do is search your motherboard number on the internet and download the drivers. you need can select what you need, sound, lan etc. your goning to have to use a friends pc so you can download these files. when your Lan is installed go to the microsoft webpage and get the latest updates, that will solve the usb in your device manager
i hope u re install your operating system,
after the re installation u did not install the drivers that is the reson, best way u buy an ethernet card and try to get net connection and down load the drivers from dell.com ,then remove the card ,thats it.