Keyboard typing numbers instead of the letters?

Whenever it a try to type a letter, it always types some random number instead of the letter. How on earth do I fix this problem?
Update: This is a desktop. I don't know what the heck is going on with it. Could it be the keyboard itself?
Update 2: It does have the ten-key number pad.
Update 3: When I try to type any letter it will type a number. Thank you,

-The VSA Administrator
4 answers 4