What do you see when you look in Device Manager. Any red, yellow, gray, or black flags? (Start-Control Panel-System-Hardware-Device Manager. If you have any flags, it is likely that you need to install a driver for that ethernet device. If you do not know the driver, it is available on using the seven digit type number.
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Just download and install it, then run Windows Update. I realize you cannot run Windows Update unless your ethernet works. But if it is not a driver, then perhaps you will need to install a new ethernet card.l they run $5 to $12 on eBay, or about $21 to $30 in your local store. The store ethernet cards are good because they come with a driver disk. To start this process, I would use another computer to download all the possible drivers from Lenovo and Intel. The Lenovo site will give you the complete configuration of your computer if you enter the model information from the label on the computer.