Around 2 days ago, my PC's screen resolution went haywire.
I normally have it set at 1280 by 1024, but the next day I logged on, the resolution was different. Not by a little amount, it looked like the PC was at 800 by 600. So I checked the resolution and... It was set at 1280 by 1024. I changed it around a couple of times, to 800 by 600, to 1600 by 1280, but no success. I restarted the computer as well, several times, and NADA (nothing).
Is there any WAY to fix this problem without having to reformat the computer?
The problem is not only affecting the desktop, but it's also affecting everywhere (Windows Explorer, any GAMES I play, etc.)

Thanks in advance,
Azka.

Screenshots

Before problem:
http://img509.yfrog.com/img509/3345/latest.jpg

After problem:
http://img143.yfrog.com/img143/325/desktopwithproblemo.png

EDIT: I shall add more system information about my computer.
Quote

OS NameMicrosoft® Windows Vista™ Home Premium
Version6.0.6002 Service PACK 2 Build 6002
Other OS Description Not Available
OS ManufacturerMicrosoft Corporation
System NameYPC
System ManufacturerDell Inc.
System ModelStudio 540
System TypeX86-based PC
ProcessorIntel(R) Core(TM)2 Quad CPU Q8200 @ 2.33GHz, 2336 Mhz, 4 Core(s), 4

Get the latest graphics driver down loaded, uninstall the current one in device manager and reboot, then install the new one.

Have you recently installed any Windows optional updates for Video drives?

Did you search the Dell site for updates to your PC?
http://support.dell.com/support/downloads/

Are you saving the changes when you make them and re-booting ? ?

1) Click Start, right-click "Computer," left-click "Properties."
2) Click "Device Manager" in the upper-left hand corner.
3) Click the + sign to the left of "Display Adapters"

Tell us exactly what it says under "Display Adapters."