Guys, if you are having troubles with Wifi that just suddenly appeared recently and no changes in your settings, it could be some F*D up Windows Update.
Since we don't know which one is responsible, you can just do a mass rollback to some previous date and see if that helps.
Otherwise, you're going to have to reinstall Windows from scratch and take care NOT to apply any updates.
It seems like someone needs to go postal at MSFT for this issue to be even acknowledged, much less fixed.