Click Product support enter the Service Tag of your computer and click Submit.
NOTE: If you do not have the Service Tag, use the auto-detect feature
or manually browse for your computer model.
Click Drivers & downloads → Find it myself.
Scroll down the page and expand Network.
Click Download to download the network driver for your computer.
Save the file, and after the download is complete, navigate to the folder where
you saved the network driver file.
Double-click the network driver file icon and follow the instructions on screen.