Read it all first? Hope it helps?
Fix One
1. The Wi-Fi or the wireless adapter driver is not updated and not compatible with Windows 10. In some cases, the Wi-Fi driver is missing after Windows 10 update.
2. If reinstalling Wi-Fi drivers doesn't help, the problem may be triggered by unsupported VPN software present during the Windows 10 upgrade. If you have an old VPN client, specifically the Cisco VPN client or Sonic Global client, it’s certain that the piece of software is what is causing the no internet connection issue on Windows 10. Uninstall the VPN software.
Microsoft has explained it:
“This issue may occur if older VPN software is installed on Windows 8.1 and is present during the upgrade to Windows 10. Older software versions contain a Filter Driver (the Deterministic Network Enhancer) which is not properly upgraded, leading to the issue.”
Wired Ethernet connections may also not function properly, if you are using built-in Ethernet adapter or a USB Ethernet adapter. Please note that some connected devices (like the very old ones) may also cause this no Internet issue.
Fix Two
Fancy explanation aside, here’s how you can fix all that and get Wi-Fi working again in Windows 10:
Step 1: To begin, launch
Command Prompt as Admin. To do this, simply right click the Start button and select
Command Prompt (Admin) from the menu.
Step 2: Enter the following command and hit the
Enter key:
reg delete HKCR\CLSID\{988248f3-a1ad-49bf-9170-676cbbc36ba3} /va /f
Step 3: Now enter this command, and press
Enter once more:
netcfg -v -u dni_dne
Preferably, you should restart your computer and check back with your Wi-Fi settings. All networks around you should now be visible and you should be able to connect to them easily.
I would like to take this moment to issue a word of caution for users running older versions of the
Cisco VPN client or Sonic Global client. If you are running any one of these, and are planning on upgrading to Windows 10, you should uninstall them before proceeding.
Hopefully Microsoft will be issuing a more passionate warning in the next few days regarding this breakage before more users find themselves caught in this mess.