Hi,
I have the same problem with an Asus VivoTab Smart using Windows 8 (not RT).
The system is in Japanese, and when I try to change the language, everything is changed except the system message boxes (even after reboots).
Do you know where I could find a complete procedure (with Japanese screenshots, as I don't read it well) to do this ?
According to all forums and Technet, it would be supposed to be easy... but it doesn't seems so...