Upgrade from win 7 to win 8.1 issue

I updated my win from 7 to 8.1 my WiFi adapter is not able to identify network.
prior to upgrade when i was in win 7 it was working.
Can some guide with troubleshooting steps that i can do.
I did uninstall the network adapter couple of times but no luck and ran troubleshooter as well but no luck.
When i ran the troubleshooter and at the end it throws an error saying the default gateway is not available .
network config is set up DHCP .
Can some one guide me here

Hello,
I'd ask in the
Windows 8.1 forum on Microsoft Community.
Karl
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