Maybe the network driver's files have been damaged, by a virus, or improperly modified by another piece of software. If this is the case, then the best course of action is to reinstall the network card driver.
You can find and download the latest version of the network driver from the manufacturer's website.
Note: To learn how to download and install drivers, check out the don't know how to download and install drivers solutions.
If none of the other solutions worked, it is possible that the computer's network card has been damaged. In this case, there is nothing you can do but to take your computer to a repair shop and have the network card module repaired or replaced.
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