Hi ,CaroSlaymaker
Welcome to Microsoft Community and thank you for sharing your concern with us today.
- Disable or close the tripartite protection software
- Try to clean the cache folder: Click Win key + S, type Microsoft Upload Center, and click the search result.
Go to "Settings" and click "Delete Cached Files".
When you are done, restart your PC and try to open the OneDrive files. These files will pop up a pop-up window asking for credentials.
3.Right-click the Win key and select "Control Panel".
Navigate to Accounts and Family Safety -> Click on User Accounts.
Find and manage your credentials and delete the OneDrive real-time account ID and password.
After that, restart the PC and try to open the required Word or Excel file.
If the file has been opened successfully, go to "File", select "Accounts", and add a OneDrive account.
4.Reset your OneDrive:
Press the Windows key + R on the keyboard to open the "Run" window.
Type the following in the window and press Enter: %localappdata%\ Microsoft \ OneDrive \ onedrive.exe / reset
The OneDrive icon should disappear from the taskbar and reappear.
If the icon does not reappear, please open the Run window again and enter the following: %localappdata%\ Microsoft \ OneDrive \ onedrive.exe
Once completed, right-click the OneDrive logo and select Settings. Then select "Select Folder".
You can choose which folders to sync. Make sure the folders you used before are set to still sync with OneDrive.
Hope this helps, and have a nice day.
Best Regards,
Hinata
Microsoft Community Support Specialist