In addition to Windows built-in Chinese input method, you can download other programs to input Chinese characters or pinyin.
1. Pinyinput: to type phonetics (pinyin) only, you can download pinyinput-install.zip.
2. Natural Chinese Input 8 自然輸入法8 華語教學加強版 http://www.iq-t.com/
(2). From other sites:
http://toget.pchome.com.tw/category/business/9461.html
http://www.fulisir.us/forums/archive/index.php/t-27570.html (you can find the code here.)
(3). English description: http://www.iq-t.com/en/PRODUCTS/going_01.asp