All your drivers are on the Windows XP CD. As a last resort...you can always try reformatting your Hard drive again and do a fresh install of your Windows XP CD, I can't see why it would not work, unless it's your actual, monitor that maybe has gone bad.
Or...
Use Windows XP's System Recovery feature, that tends to work real well, you can even try to boot into Safe mode first, to rule in or out your Monitor and or Network card etc... problems, because it just will use the most basic drivers and if they don't work there, then call back dell and get a new CD or whichever.
Always, remember when possible, CHECK IN DEVICE MANAGER, to see that you have a monitor, Network card driver or not and if they are working properly or not, usually if not you will see, it's got a yellow triangle with an ! point inside of it that will confirm a driver or hardware problem.
Unfortunately,... these days they assume everyone always has internet access, even when their internet access is not working!!! It's truly ridiculous too....I can't tell you how many times,... I have had connection problems and the only help available was "please see online &^(&& .com for help" what morons! Good luck.