HP w2207 problems

This might seem dumb to some of you since I'm not a computer experts. I recently purchase a LCD widescreen from Hp (w2207) and since I replace the new monitor, the message on the screen keep popping out saying Signal Out of range, my max screen resolution is 1024 x 768 and the monitor recommend 1680 x 1050, What do I need to do to meet that requirements? Update driver or replace/increase the graphic card ? blah blah I really have to idea, I remember there was an option to increase the screen resolution to 1600 x 1200 which isn't compatible (?) and I know I'm running in a lower resolution which makes the images looks fat ?!. I'm only 12 this might sound dumb. Please help