I'm Greg, an installation specialist and 8 year Windows MVP, here to help you.
There are problems with the security permissions on the account. There are some fixes that sometimes work, and if not what almost always works is to test a new Admin Local Account and if there are no problems move your files over and when ready delete the old account.
For some it can be resolved by simply taking ownership of the drive. The Easiest way to do this is by installing the Take Ownership SHortcut to your right click context menu to use when needed: https://www.askvg.com/add-take-ownership-option...
Or you can do this manually in the file or folder Security Settings: https://www.askvg.com/guide-how-to-take-ownersh...
If this doesn't work then the account is corrupted badly enough I'd replace it by creating a new Local Admin user account, sign into it to test it out, if it works then move your files over. Later you can delete the old account - if necessary first changing a MS Account to a Local Account to delete it, then affiliate the MS Account with the new User Account:
http://www.kickiteasy.com/add-a-new-user-accoun...
http://www.zdnet.com/article/windows-10-tip-swi...
https://www.tenforums.com/tutorials/5375-switch...
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.