OK so my upgrade to Windows 10 new version may have gone smoothly, but a thing I noticed after booting to the Desktop was that there was no Network icon in the Notification Area of the Taskbar and there was no way I could connect to the Internet – whether it was to my cable broadband connection or the WiFi.
No internet access after Windows Upgrade
I opened Windows Settings > Network & Internet, and clicked on the Status link. Here the Network status was showing a No internet access message.
1] Run Windows Network Diagnostics Troubleshooter
If you see this message, you need to click on the Troubleshoot button. When you do that, the Windows Network Diagnostics Troubleshooter will open and try to fix the problems.
One the job is done, see if it has helped.
This worked for me.
2] Use Registry Editor
If the Network icon says No internet access, but you are connected, do the following:
Open the Registry Editor and navigate to the following key:
On the right side, locate and right-click EnableActiveProbing.
Select Modify and change its Value data from 0 to 1.
Click OK and exit.
Restart your computer and see.
3] Use Hardware and Devices troubleshooter
4] Use Network Reset
Use the Network Reset feature and see if that works for you.
These posts offer additional troubleshooting suggestions: