If you only have an old SP1 version of XP install disk, you can download sp2 free from MS. Then use free program called nlite to slipstream sp2 and any driver updates you need, to create a new bootable install disk. You can even make it an unattended install disk by specifying your time zone, language, screen resolution, etc before you create and burn the .iso image.
err... just saw recent post where SgtShultz said the same thing.