|Go to Dell's Support site, and enter the Service Tag of the machine. Then, download the chipset drivers for XP. Install those first. Download the video drivers, and any others you need. If after installing the chipset and drivers and rebooting you still don't have the option to change the resolution, install the Video drivers.|
If you have the Dell Resource CD that came with the computer, all the drivers are on there, and you don't need to download anything.
"So won’t you give this man his wings
What a shame
To have to beg you to see
We’re not all the same
What a shame" - Shinedown