My Onedrive account won't sign in and therefore doesn't sync. Found a number of suggested remedies and none of them work. I am at the point that the only way I think I am going to get it back is to do a clean install of Windows 10 and i certainly would like to avoid that. As it is built in to Windows 10, I can't uninstall it and reinstall it and there is no way to manually sign in. Really need some help here.