Going to post this again. I'm literally at a complete standstill with this. I don't know what to do next.
Please help, guys.
I went through the Media Creation Tool process. Everything there went very smoothly. It went through all the prompts. It started installing Windows 10 and I don't know what percentage it got to but it was over 75%, and the system had to restart. Well, while it was doing that I went out to the kitchen to get something to drink. I came back and it was on the Gigabyte splash screen saying something about "boot failure". So I had it just reboot the computer and...now I'm just back in Windows 8.1, like nothing ever happened.
What happened? Am I able to resume installation somehow? It's so bizarre.