Well you are still not giving enough elaboration.
Do you mean adjusting font size of Chinese characters in programs like Microsoft Word, etc?
Or do you mean system language?
As I said earlier, a screenshot will help.
Take a screen shot by pressing Print Screen/SysRq on your keyboard. Go to Start > Run and type in "mspaint". The Paint program will open. Now paste. Save the screenshot as a JPEG and post it in your next reply.
If you have any other queries, please do not hesitate to ask. Remember, more elaboration will help me understand your issue better.
