The OneDrive troubleshooter is a tool that can find and automatically fix these common problems with OneDrive in Windows 8.1 and Windows RT 8.1. Remember it does not work on Windows 10 CTP.
The following issues are fixed:
OneDrive doesn’t appear in the left pane in File Explorer.
Even though you’re connected to the Internet, you can’t connect to OneDrive.
Some of your OneDrive files or folders are missing on your PC.
Some files or folders won’t upload from your PC to OneDrive.
The OneDrive icon doesn’t appear in the notification area, at the far right of the taskbar. (In Task Manager, the sync engine process doesn’t appear.)
You get the message “You don’t have permission to save to this location. Contact the administrator to obtain permission.”