Excuse my n00biness, but how can you install XP on it if it has no DVD drive?
Off a jump drive. Or a USB dvd drive. Or write out an XP image to the drive using Acronis (or disc imaging of some sort). Or use PXE to boot Windows XP installer over the network. Or run VMWare ESXi on it, giving a VM direct access to the drive and doing any of the previous. Or pull the hard drive out, throw it another machine and install XP.
I'm sure there are more, but I'm late for work.