Ever since I got the Windows 10 update, my internet connection hasn't worked. How can I fix it?

[WPCentral Question]

Ever since I got the Windows 10 update, my internet connection hasn't worked.

I finished the update this morning and a popup window has said that "This version of the operation system is not supported". The internet says it has limited access through both wi-fi and LAN connections. How do I fix this?