I don't think the LAN card driver has been installed.
Check which LAN card you use and install the driver.
I don't know what kind of computer I use, but if it's a PC, there are often built-in LAN cards on the main board.
You can download the driver if you go to the main board manufacturer's website.
If I use a laptop, there's a problem after reinstalling the window.
If you go to the official website of the laptop manufacturer and download and install the driver for the laptop that fits the operating system, you can access the Internet.
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