The pre-Windows 2000 computer name %2 is not a valid computer name. It may contain illegal characters. Standard names contain ...

The pre-Windows 2000 computer name %2 is not a valid computer name. It may contain illegal characters.  Standard names contain letters (a-z, A-Z), numbers (0-9), and hyphens (-), but no spaces or periods (.), and the name may not consist entirely of digits. The error returned was: %1