Dear SiewChung,
Try this, in any internet browser in incognito mode (Ctrl+Shift+N) browse to: https://onedrive.live.com, access with your personal account, then if you are no allowed to access, is due to situations: 1- Servers has a temporary service degradation, you have to wait up to 48h. 2.- Microsoft detected an inappropriate use in your account, or a breach of Microsoft Service Agreement:
https://www.microsoft.com/en-us/servicesagreement
But if you are able to access, you could re-install Onedrive client in this way;
Do you know how work with the "Regedit"?
So, with the keys combinations (Windows + R), you'll open the "Run" windows, then type: regedit
We need to find Onedrive folder and delete.
you will find it in this path:
HKEY_CURRENT_USER\Software\Microsoft\
Expand Microsoft folder click on the "arrow", inside you'll see the Onedrive folder, click with "Right-Click" over Onedrive folder and delete all.
This process only remove Onedrive configuration, the data will be fine.
After, uninstall Onedrive from Control Panel and re-install again with the file that you'll download in this official Microsoft Support:
https://support.office.com/en-us/article/onedri...
Download the last Production Ring version: 20.084.0426.0007 and install it.
Finally, It is possible that you need to put your credentials again, then when you select the folder location for Onedrive (use default folder), maybe will appears a message that says "This folder already has information/data", so, in the same way, select that location and accept.
Regards,
Renzo.