All ths talk about Hanja . . . I forgot to mention you can type Korean on your computer, regardless of where you bought it.
It'll take a little while for you to memorize where the Korean letters are on the keyboard. I recommend buying a Korean keyboard at the store. It'll plug right into your USB.
Anyway, here's a guide to getting Korean to work on your computer. You have to install/activate the Korean IME. You also have to tell your computer to recognize Korean letters on the keyboard.
http://www.declan-software.com/korean_ime/korean_ime.htm#XPinstallYou see to the right of the space bar that it says "한/영"? You press this button to switch from Korean 한 to English 영. If you don't have a Korean keyboard, you have to display the language bar and switch the language bar to Korean. (the above link explains this.) The bar should have 가. If you press "alt" to the right of the keyboard, it'll say "A."
Incidentally, the 美 up there is the button you'd click to type Hanja on a non-Korean keyboard.