Thank you for posting this, in detail!! Gave me the starting point I needed to fully fix the issues with the upgrade to Windows 10.
For those reading this now, if you have a way to do so, download [or flash] your WiFi adapter drivers [if they are firmware components], or have the install disc ready for any USB WiFi adapter you are using. Start by following the above instructions and TURN OFF the WiFi on your computer to finish the install of Windows 10. If you are stalled out anywhere around the "log in" screen, reboot your machine after disabling WiFi. Then, follow these steps:
- Enter Password and press 'Next' on the install log in screen for Windows 10.
- Bypass the 'Setup Internet Connection' by clicking the 'Skip this Step' near the bottom left of the screen.
- Follow the prompts to configure your "home screen" and finish the install of the OS to your system.
- Once the OS installs and your system loads, follow whatever paths are presented to log in.
At this point, you will have to start the process of install ALL third party drivers. That's right, EVERY SINGLE driver for a third party [USB, PCIe, etc.] component needs to be reinstalled after the OS update. WiFi adapter, WiFi card, sound card, and Graphics cards; any drivers for these components were overwritten by Windows when upgrading to 10. Microsoft decided that if it was not on the motherboard and firmware, it was not to be saved/used. For those that might be keeping score, that means that the fundamental flaw of Windows 8.x was maintained: the "desktop" version of Windows 10 is actually a backward-port from the framework OS that is initially [and functionally] designed to operate on laptops, tablets, and any other "mobile" device that will accommodate the OS. For someone like me, who uses custom-built desktops, that doesn't work well... This is a sad issue to face, but thankfully this process should fix everything for you. Once you reinstall your WiFi drivers, you should be able to connect to the internet. [NOTE: I am using custom-built desktops, with USB WiFi-adapters, so I would be curious to know of the above process does, in fact, work on a laptop/firmware driver "update" after the Windows 10 update.]
I hope, between the OP I reference, and my follow up, fewer people will bang their heads on their desks when the Windows 10 update stalls out on their end.
Cheers!