when I hit the "n" key, it adds a seven, when I hit the "b" key, it adds a four, when I hit the "?" key it adds a parenthases. when I hit the "4" key it is preceded by a "b", when I hit the "7" key it is preceded by an "n", the back arrow key no longer works, etc.... This problem just started moments ago. There are other keys affected, I'm sure, but so far, these are the ones that I have found. How can I fix this problem, all the backspacing is wreaking havoc on my attempts to write papers for my classes!!!!!!!!!!!!!!!!!!!!!!!!!