I recently installed a 64 bit Windows 7 to my Inspiron 1521 which its OS was Windows Vista 32 bit. The screen resolution is off due to an incorrect height - width ratio and the max is 1024 x 768 where it should be 1280 X 800. Since it has a new OS, its service won't help to find a right display driver, I assume. How can I find a right display driver in this case?

Thanks for your inputs in advance.