I’ve discussed at length how to fix SkyDrive sync issues. Check out Another possible solution for OneDrive / SkyDrive sync issues and Possible OneDrive / SkyDrive sync fix for Windows 8. I have found that sometimes even resetting SkyDrive doesn’t fix the problem. Microsoft will charge you for a brute force approach, but I figured out one more option if nothing you’ve tried has started syncing back up again. Before you follow these steps, try the other two – this is a last ditch resort!
1. Make sure all other desktop and “modern” applications are NOT running. Only File Explorer should be running. Word, Chrome, whatever – they should all be closed.
2. Press Windows Key + X, select Command Prompt (Admin), and the Windows command prompt should appear.
3. Make sure the OneDrive app isn’t running – right-click it and select Close if you see it in the taskbar.
4. Type skydrive /shutdown
5. Wait a minute.
6. Right-click the task bar and select Task Manager.
7. Keep trying to end the OneDrive Sync Engine process until it disappears, as shown in the figure below. This may take a few tries.
8. Open the following folder:
C:\Users\your user account name\AppData\Local\Microsoft\Windows\SkyDrive\settings
and you’ll see something like the figure below:
9. Delete all the files except for ClientPolicy.ini and global.ini.
10. Once they have been deleted, type the following: shutdown -r -t 0
11. Your computer should restart.
12. Log back in and your files should start resyncing. You’ll probably see results within a few hours. This will depend on the total number of files you have on OneDrive. You’ll also see downloads.txt and another funky-looking file start growing in size. If you see that, you know things are working, and OneDrive has started rebuilding everything.