You are using the Dell Resource CD provided by the manufacturer. This CD may not work with new versions of Internet Explorer that come with SP3 installations (if you reinstalled from a Windows XP CD not provided by Dell or if you did the Microsoft SP3 update).
You're only solution would be to use your "Service Tag" number underneath, for laptops (or on the back/side for Desktops), of your computer and go to http://support.dell.com
to download the drivers for your specific system. If this computer doesn't have the drivers for you to be able to go to the internet, use a second computer and go to the site. Then download the individual drivers listed (the latest dated drivers will work best).
Once you've downloaded mainly the Video, Network, Audio drivers, use a USB Flash drive (sometimes called USB Key, USB pen drive, USB drive, etc) and copy what's been downloaded onto it. Do not double click on the files while they're on the second computer.
Once on the machine with Windows XP SP3, double click on each downloaded file (1 at a time) and follow the on-screen insctructions to install the driver. You should be fine afterwards. :) Let us know how it goes, and rate us. :)