it was strange it was easy to get the win7 machine connected but it would not access the internet. I turned off my airport extreme and then I had internet access. so even though win7 showed no internet on the Ethernet connection it would not jump over to the tethered connection. I need the airport to network to my other computer so it would be nice to get around that. I wonder if a usb connection would be better? I did not have a lighting connector at the time.
but was a nice save got the files from the emails and was able to work.
The theory is simple. Your Win machine is still going through the normal WIFI to get to the Internet, it doesn't know the connection to the outside is down.
When u enable tethering, do you tell the Win machine to start talking to a new hotspot? You may have to refresh your IP AFTER you have connected to the phone.