If it has ME or 98 installed forget it as the minimum reasonable amount of memory to run xp with sp3 installed is 512MB and a ME/98 laptop will probably have 128mb possibly 256mb and the memory will either be unavailable or ridiculously expensive. Plus any existing drivers are unlikely to work. Aside from which odds will be that there won't be XP drivers available on the manufacturers site and you'll have to identify the various components yourself and download drivers from the component manufacturers website (assuming that the devices weren't obsolete prior to XP being released)
If it's already got XP installed and you're just trying to speed it up with a clean install then possibly a repair install might just work as it renames the old windows directory and you might be able to install the drivers by referencing the old window directory. But then you'd lose any additional software in the programs files directory for which you lack the cds/downloads for.
So, as mentioned by prior posters, what is the current state of the pc with respect to make and model, os, ram and disk size etc etc.