Wifi not working after Windows 10 upgrade

Some times your wireless and wired network adapters may not work after upgrading to Windows 10. As per Microsoft the reason may be due to some VPN client softwares installed in your computer. Listed below are the troubleshooting steps. 

1. Remove any VPN client software(Cisco, SonicWALL, Fortigate etc) installed in your computer before upgrading.
2. If you have already upgraded try removing it. Mostly it won't work as it will show error while trying to uninstall. 
3. Try uninstalling all the network adapters from device manager and reinstall again. 
4. If it doesn't work the final step is to downgrade to Windows 8/7, uninstall the VPN Client software and upgrade to Windows 10 again. You can downgrade from recovery options. (Click on Start-Settings-Update and Security-Recovery)