Can you access any other share on that controller from your Windows 7 workstation? If no, then check the SMB signing security settings on your workstation and make sure that 'requiring signing (always)' is not set to 'enabled'
If you can access other shares, then make sure that this option is set (assuming you are an Admin on the controller) 'options wafl.nt_admin_priv_map_to_root on'
Vol0 where /etc resides is typically set to Unix security style so the above option will map your windows user to 'root' on the filer assuming that your windows user account is a member of the local Administrators group on the filer.