Windows Update now it can't boot up

That is the Media Creation Tool I referred to earlier. I tried that but I couldn't seem to get it to work properly.

I was able to install it on a hard drive/USB just fine, but when I plugged it in and booted it up it just sat on a black screen for forever. I gave up after letting it sit for a few hours and no change

So something is amiss right there.

You have a complicated PC so it's time to make it simpler. Two NVIDIA GeForce GTX 770 are not required. We don't need any other SSD or HDD than what we are going to install to.

Can you make the PC as small as possible?

Also, any USB device that isn't a keyboard or mouse shall be removed. Windows can hang on install because of this and bad drives.

The only things I had to remove were my 2 graphics cards. Everything else was already disconnected.

That allowed the creation tool to boot up but I'm not out of the woods yet.

I tried poking around but none of the repair options worked. It failed when I tried to restore to a previous backup, it failed when I tried to rollback the upgrade, it failed when I tried to do a repair, etc.

After all of those failed I just tried telling it to install Windows 10, but unfortunately I'm not sure of all the settings I need to specify.

Screen #1) I said I don't have a key (which I don't since I upgraded from 7).
Screen #2) I chose Windows 10 Home (pretty sure I had home and not pro).
Screen #3) The Upgrade option doesn't work so I did an Custom/Advanced install.
Screen #4) Then it starts asking me about my various drives and partitions and I'm afraid of screwing it up so I stopped.

Can you link me to a guide on using it? I can't find one. Or any advice you can give.

Thanks for your help so far.

The ugly truth is not all repairs succeed. I can only suggest you wipe the drive clean and install the OS again. If you are trying to salvage files, you do that first with the many tools we have today like I noted long ago at http://tips.oncomputers.info/archives2004/0401/2004-Jan-11.htm

If you feel the OS can be repaired, I defer to Microsoft and others.

I'm not worried about salvaging anything. As I said, I kept most of my stuff on the hard drive that didn't contain the operating system.

At this point I don't really care if I wipe it or repair it. Repairing would be nice but its not that big of a deal.

In my previous post I was asking how I do any of that. How do I use that media creation tool to do anything (repair OR wipe)? I'm going through the screens but I'm not sure what to select. That's why I was asking if you knew of a guide or could guide me through it yourself.

But you ask what to select or where.

At some screen Windows is asking where to install. That screen has an advanced option to manually partition which is used to delete all the partitions on the blown OS drive.

But which drive? There should only be one attached at this time to avoid a total wipeout of what folk call data drives.

I eventually found a guide on my own and realized that the 2nd drive that was showing up was the bootable one that I had connected to do the install.

Everything seems to be working so far. Its booting and I'm redownloading all my programs. Unfortunately I lost basically everything since I didn't set up my 2nd hard drive properly apparently but live and learn.

Thanks for your help