Windows 7: Problems with screen resolution

I recently downloaded and installed Windows 7 on my Dell Inspiron 9300. I am having trouble configuring the resolution to a reasonable size. When i had XP the resolution was 1920 x 1200. The max resolution now is 1600 x 1200 which makes everything stretched out. What can i do so i can get the 1920 x 1200 resolution back?

get the driver for your video card/chipset and install it

tell us about your hardware so we can help you

ken

i believe i tried downloading the video driver and was prompted that i did not need to update the driver.

the video card is:
ATI Mobility Radeon (M24)

the service tag is fp0ch71

i just downloaded that dell audio driver (ATI MobilityRadeon X300 Driver) and it gave me the following error:
"An error occurred while unzipping. One or more files were not successfully unzipped. The error code is 40."

(I get the same error when downloading the audio and chipset drivers)