There's at least 25 (or more) previous threads identical to yours. We get really tired of answering the same thing over and over so why don't you find and learn to use the Search this Forum
link found at the top-right of this forum?
A RTL8139 network chip is one of the most common in the world today. Drivers can also be found in our driver database by using the Driver Search Wizard
and visiting the Realtek website.
So please make use of the tools we provide for you and don't be lazy and fail to READ before