Hi thank you both for your help I got it solved. What happen was that when i try to resize the screen through the display settings I also enable the compatibility mode that ran the emulator in windows 95. I just uncheck it and it works fine. It did say ram messed up and crashed which scared the hell out of me.
Also, does anyone know how to mod a ds lite to play games on it. Can you direct me to a link for more info thanks....