I have recently upgraded to Windows 10. I loved the changes, until yesterday.
I am signed in as the administrator of my account. I tried to save a simple spreadsheet to Documents in One Drive. I received this message:
"You don’t have permission to save in this location. Contact administrator. " The message also gave me the option of saving to my Document folder, but even if I checked “yes”, nothing happened.

I did not have this problem previously until I tried to save to One Drive.

I then discovered by trying other applications, such as Word, that I could not save any file to any location, such as documents on this PC. For reference, I am neither a CS major nor a developer. To the contrary, I am a retired mathematics teacher in my 60’s. However, I can follow instructions as outlined if you are able to help. Thank you!