Windows 7 Resolution Problem

[BttleFedC10]

I installed windows 7 home premium 32-bit in my
computer.
Everything seemed to work fine except the
screen.
My screen is 17'' Sanyo screen.
The computer zooms the screen in and makes
it to small..
Everything i'm doing doesn't fit in the screen.
When i try to change the Screen resolutions it
says :
You can't change this settings because the
height of your display is less than 600 pixels..

I didnt know the specs, So heres a website with the specs.

http://reviews.cnet.com/desktops/dell-dimension-2400-pentium/4507-3118_7-30824846.html

Everything is untouched on the computer except I installed 2G of ram and a extra internal hard drive, and a dvd burner.

[LS1Goat]

it says clearly that your max. resolution is 1024x768.

if you want to make things appear larger then reduce the resolution.

[BttleFedC10]

ITs not letting me adjust what so ever. Right now its at 640x480

[Tx Redneck]

It sounds as if it didn't install a driver for the video adapter. What's the service tag number on the tower?