Fix Windows 10 ethernet adapter disabled/missing

I have clean installed of Windows 10 on my computer but the network connection always doesn’t connect to the internet in the system. I access the Network Connections in the control panel, and notice that the ethernet adapter is disabled, as well as the Ethernet Connection properties say the driver is missing under device manager. I turn it on manually and that does nothing. Using troubleshoot utility doesn’t take any effect. How can I resolve the problem?

The issue is software related definitely and happens after your tablet or computer is upgraded to Windows 10. The Network symbol gets red cross mark and the Network adapter is missing, even the realtek device is listed in device manager. You could try any of the methods to get rid of that.
The older VPN client will be out of updated once you update the OS to Windows 10. If you have installed the VPN client such as Cisco anyconnect client, follow the solution to fix No Wi-Fi or ethernet Available.
* Right click the Start button from your desktop, and select Command Prompt (Admin) from the menu.
* Type the command below and press Enter to make changes with the Registry Editor.
reg delete HKCR\CLSID\{988248f3-a1ad-49bf-9170-676cbbc36ba3} /va /f
* Then input the command and press Enter to execute it:
netcfg -v -u dni_dne
* FInally restart the system to apply that.

If it is still not working, go to change something with BIOS.
* First boot into your BIOS setting, go to Advanced > Onboard devices > CSM, and set ignore with boot from network option.
* Then save the setting and exit BIOS. Worked for me.

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