awa
http://www.google.com/search?q=fn+key+disable
The "problem" is simply that there is a persistent toggle. If you press "Num Lk" (I've also seen it labeled "Pad Lk" for numeric Pad) it turns on the blue keys, and inverts the meaning of the "Fn" key - it's a way to use that embedded numeric keypad without having to hold down the "Fn" key the entire time.