I want to use Unikey. How to use UniKey?

http://translate.google.com/translate?prev=hp&hl=en&js=n&u=http%3A%2F%2Fwww.unikey.org%2Fmanual%2Fukmanual.htm&sl=vi&tl=en

Download, install then you are good to go

Choose "E" when you want to type English, choose "V" when you want to type Vietnamese

Good luck :)

-Michael