Trouble Typing Language

[han le]

DOMAIN NAME: HENVESAIGON.COM *ID#67.228.244.197

*I first build Website. TYPING VIETNAMESE LANGUAGE ON HOMEPAGE.
when I finished 1 sentence, THE WORDS WERE CHANGED like this:
..V? T? C?...
I set correct language in PC & BlueVoda: UTF-8
My PC run XP packacge3.
Typing VietNamese on MS Word & Yahoo Mail is OK...
Please help me
Thank in advance
Han Le