Open Regedit and browse to

 

HKEY_LOCAL_MACHINE\System\CurrentControlSet\Services\CSC\Parameters

 

If the Parameters key doesn't exist then create it.

 

Add a DWORD value named FormatDatabase and set its value to 1.

 

Ensure Offline Files is enabled.

 

Restart.

 

 

This also removes previous partnerships in Offline Files. You will need to re-register the paths to sync with.