Unable to enter native language computer name during OOBE on Windows 8 and Windows Server 2012

This problem occurs because the active codepage (the codepage of the default language of the system image) is not compatible with the codepage of the language selected in OOBE (Out of Box Experience), and the active Windows system codepage cannot be changed without a reboot.  The validation code for the computer name is checking the entered computer name against the active system codepage.  After a reboot, the computer name validation code will allow characters in the language the user has selected.

You must use characters which are valid in the active codepage for the computer name during OOBE.  You may later change the computer name to use characters in the native language after OOBE has been completed and the system has been rebooted at least once.

For example, a multi-language image may contain two or more languages, usually English, and another language such as Russian.  If English is set to the default language for the image, then on first boot, the English code page will be active at the time Russian is selected as the language during OOBE.  The computer name must be entered using characters valid in the English codepage, such as ASCII characters.