You'd said you'd tried everything with firewall, but have you tried turning off your firewall and any internet security altogether before download/install?

The first thing to do is check for driver updates, and make sure they are the correct drivers for your hardware. Bluetooth/Wireless drivers are usually downloaded as a package, so it might make...

If you just want to be able to restore, I would suggest using the Create Restore Point tool which work as a quick easy fix if anything goes wrong. If you still want a system image to boot off of or...

Are your wireless drivers up to date? Obviously it's working because you can connect, but if you still have windows 7/8 drivers that could be causing the issue.

Are you still having these problems? From what I can tell of your problem, you were able to restore via ISO to Windows 8.1 correct? But you still couldn't get on the internet. Without knowing your...