Hi, I am Dave, I will help you with this.
1
The best first option would be to go to the support page for your PC on the manufacturers website to download and re-install the Ethernet (LAN) device drivers they provide.
2
If that does not solve this:
Click your Start Button, type cmd and choose Command Prompt
Run this command and hit Enter:
ipconfig /flushdns
Run this command and hit Enter:
netsh winsock reset
Run this command and hit Enter:
netsh int ip reset
Close Command Prompt
Open the Settings App
Go to Network and Internet
Click the Network Reset button
Wait for your PC to automatically restart after 5 minutes, do not manually restart your PC.