I have a Toshiba Satelite C75D-B running Windows 8.1.. Basically my computer has stopped using IPv6. It will not work on ANY wifi network I try. I suspect it is the computer and not the networks.. When I open up the wifi status is says IPv6 Connectivity: No Internet Access. I have tried EVERYTHING that I found on the web to solve the problem. None worked.. I did the full netsh winsock and int commands run cmd as admin, when I did the full netsh int command it said OK! for all of them then said Resetting , failed Access is Denied. I ran as admin... Please help... It's really annoying to have to keep disconnecting and reconnecting to the wifi to use the internet.