Quote from steve0617:
Most likely, you will not be able to use any other disk you come up with. MS has some several dozen versions of XP between OEM, retail, builder versions etc etc etc and the chances of you getting the exact flavor of XP that your current install seeks is slim at best.
So, expect a full install.
That said, call Dell and see what they can do. Maybe it's too expensive for their replacement disc, but it's worth a shot.
I disagree. You are not re-installing the entire OS. I think it will only access whatever files it needs to make the repair, assuming it can be repaired at all. So, any authentic XP Pro disc will work. If you have to, buy a copy from a reputable ebay merchant, making sure you get the license key, fix the problem, and re-sell it on ebay when you are done.