You'll need a stable Admin account to properly upgrade to the new version. It seems that what you may have done is renamed your Admin account since it's using a MS email account - is that your regular MS account email? If so you can rename it to your name in the online MS Account.
If necessary try enabling the Hidden Administrator account to log into and set up a new Local Administrative Account to sign-into, move files over and set up, using whatever method given here that works: http://www.top-password.com/blog/4-ways-to-enab...
http://www.howtogeek.com/226540/how-to-create-a...
To do this you'll need to access a Command Prompt in repair mode by one of these methods: https://www.tenforums.com/tutorials/2294-advanc.... If you don't have the password this may be limited to using the booted media.
If necessary you can create Windows 10 Installation Media on another PC: http://windows.microsoft.com/en-us/windows-10/m...
Insert media, boot it by powering up PC while pressing the BIOS Boot Menu Key: https://www.sysnative.com/forums/hardware-tutor...
Choose the boot device as a UEFI device if offered. If the media won't boot you may need to enter BIOS/UEFI Setup (pressing key given in chart in link above) to turn off Fast Boot or Fast Startup first.
After it loads, on second screen, choose Repair Your Computer, then Advanced Troubleshoot Options for Command Prompt.
If this fails from the Troubleshoot Options try a Reset, saving files.
I hope this helps. Feel free to ask back any questions and let us know how it goes. I will keep working with you until it's resolved.