I think the windows connection help wizard might have actually fixed a connection issue I had once. Out of more chances than I probably should have given it, considering how often it did dick all, despite my phone's connection being fine.

I think there's a rare race condition or something in the windows network stack because I've had four different machines suddenly lose the ability to connect to working networks, where sometimes toggling airplane mode would fix it, sometimes even that wouldn't do anything and it needed a restart. It happened more often with wireless connections, but I've seen it affect wired ones, too.