Did you restart the computer while pressing the shift key? Keep pressing it down until it boots up.
I'm not sure what fixed it but this is what I did.
I made the win10 dvd and booted to that. It then told me to remove the dvd and restart. That didn't seem to work so I decided I would reset the computer back to 8.1 if I could so I tried the "reset windows 10" on this page-
http://www.howtogeek.com/224342/how-to-clean-install-windows-10/
scroll down to "perform a reset and remove everything"
To reset your Windows 10 PC, open the Settings app, select Update & security, select Recovery, and click the “Get started” button under Reset this PC. Select “Remove everything.” This will wipe all your files, so be sure you have backups.
I selected "keep my files" because I don't want to Remove everything.
When it was done I now had windows 10 and it's working fine so I think the reset somehow repaired it. A bunch of my programs were gone but it does give you a list of what was removed.
Holding the shift key while restarting got me into the settings app
The problem seems to be that the win10 install never finished because my system info shows I was still using win 8 but win 10 was trying to load but couldn't.
Also, if you get a screen where it wants the product key when trying the dvd install just click on "skip" and keep going.
Hope this helps!