You go to the Acer website, select your country, look for "drivers and downloads" and then go through the process of entering your computer. It will take you to a page with the available downloads. Find the ones for your NIC, download it and double click on it to start the install. If the machine in question is not connected to the Internet at all, you will have to download the driver on another computer and move it over to the one that needs it with a flash drive or CD.
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