You should see a lot of folders listed under the Namespace folder.
See below, it is example of mine.
I have four folders listed under "Namespace". As I go through each folder, for example, the first one, I see "OneDrive-personal" listed on the right. Then that's the foldername I want to write down., which is {018D5C66-4533-4307-9B53-224DE2ED1FE6}.
Then right click on {018D5C66-4533-4307-9B53-224DE2ED1FE6} and delete it. (Note, this is MY example, yours may not be the same name, this is why I asked that you write it down).

After that, go to this path in Registry Editor,
HKEY_CLASSES_ROOT\CLSID
Look for a folder that matches the one you wrote down above. Right click on it and delete.
Restart the computer after that.
Then reinstall OneDRive, and see if it works.