1. Right-click Properties on this computer.
2. Click Device Manager in the pop-up dialog box.
3. Find the network card under the network adapter in the device manager. Because there is a notebook and a virtual machine installed here, there will be three others. Double-click on the network card.
4. click advanced in the network card properties that pop up.
5. Double-click the link speed and working mode options, and the network card will be adjusted to full speed.