I would assume that you will need to buy a copy of XP Home or PRO or Media Center. I would not expect the dell oem disk to work.
I bought a dell oem copy of xp home about 6 months ago and tried to load it on a system I had built and NO GO!!!. They had removed all sorts of drivers from the CD.
So plan on buying your OS TOO!
These aren't the drones you are looking for....