Ok that makes a difference.
There is 3 things I can think of offhand to check.
1. The language settings in the control panel. Which I think you did.
2. Are you running software for your keyboard. If so try to just run it as a standard PS/2 Keyboard.
3. Its possible that the font being used is corrupt and changing that could help.
As for Japenese to Chinese the only thing I have to offer is I have seen that there is regular and simple chinese. I dont know the difference. Possibly the problem lies with that. Otherwise this may be a good thing to speak with MS about.