You need to visit he Dell web site, enter the tag number for this machine and see if Dell offer any help and/or drivers for installing XP on this system.
If not, then you will have problems finding the drivers necessary to install XP. For example, if this system has a SATA hard drive, you will need to find a way to install SATA drivers during the install, as XP never came with those.
You may fail. Many of the newer systems are not compatible with the older XP OS.
I just bought a new computer yesterday. (Dell Studio XPS) It came with windows 7 but I would like to wipe it clean and put XP on it. I tried to put the XP install disc in and boot from disc. It goes to a blue screen where i loads files for a while then a blue screen pops up that says error windows is shutting down for your safety or something like that. I tried doing it 3 times and the same thing happened every time. This is a brand new computer with nothing on it. Is there another way to about installing XP?