C:\Program Files (x86)\WinSCP\.
It would help, if you post a complete error, not just "error 5". But I suppose that WinSCP is able to copy configuration from INI file to registry, but needs to delete the INI file afterwards, what obviously fails (no permissions).
- Delete the INI yourself (make back up). This would work providing the import to registry succeeded.
- Run WinSCP as administrator for the INI to registry switch.
- Use WinSCP 5.2 beta that allows importing configuration from INI file located anywhere: