help!How to use American computer in Chinese

help!How to use American computer in Chinese
I am a student in American now~
The compouter can't type in Chinese~
I am so sad~I want to speak to my parents and friends~
who can help me .I need a software which can make my computer work in chinese~
thank you .
sorry~the school I am Living,don't allow me to change the time on the computer,so~if you have software which can solve the problem?
and~could you speak Chinese~Thank you all the same