I have hundreds of Office files (Word, Excel, etc.) in the Documents folder on my laptop drive (C:). They are all editable (i.e., none of them is designated "Read Only"). This morning I activated my OneDrive account and copied some Word and Excel files from my C: drive to the OneDrive. After that all files on both my OneDrive and on my C: drive (including files that I did NOT copy to OneDrive) open only in Read Only mode. If I edit a file and try to save it under a new name, I get an error message that says I don't have permission to save to the folder. Basically I'm no longer recognized as the Administrator even though I'm the only user on the computer. I tried reinstalling Office 365 but that didn't work. Any suggestions?