If you lost your network connection immediately after upgrading or updating Windows 10, it's possible that the current driver for your network adapter was designed for a previous version of Windows. To check, try temporarily uninstalling the recent Windows Update:

Select the Start button, then select Settings > Update & Security > Windows Update > View update history > Uninstall updates.
Select the most recent update, then select Uninstall.

If uninstalling the most recent update restores your network connection, check to see if an updated driver is available:

In the search box on the taskbar, type Device Manager, and then select Device Manager from the list of results.
Expand Network adapters, and locate the network adapter for your device.
Select the network adapter, select Update driver > Search automatically for updated driver software, and then follow the instructions.
After installing the updated driver, select the Start button > Power > Restart if you're asked to restart, and see if that fixes the connection issue.

If Windows can’t find a new driver for your network adapter, visit the PC manufacturer’s website and download the latest network adapter driver from there. You’ll need to know the PC manufacturer and model name or number.

Do one of the following:

If you couldn’t download and install a newer network adapter driver, hide the update that’s causing you to lose your network connection. To learn how to hide updates, see Hide Windows Updates or driver updates.
If you could successfully install updated drivers for your network adapter, then reinstall the latest updates. To do this, select the Start button, then select Settings > Update & Security > Windows Update > Check for updates.

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