Hey jayce it sounds like your CD/DVD drive is giving you nightmares.
Lets Try this:
1.Either find out what CD/DVD drive that customer has and reupdate the firmware with a newer one.
Please don't try to flash the CD/DVD drive or you'll have a great time explaning to the customer why their dvd drive died...
or
You can download windows xp home sp2 from a legit site safe sit, I can't say it here or risk getting shown the door out of tech-forums.
Beaware that you have people on the net playing one trick ponys with XP's home and Pro ISO and using more harsh corparate versions so be careful of what you download tonight.
Try installing XP from a flash drive if at possible or try a SD memory card reader.
I've done it from the memory card a few times and it works just fine as long as my motherboard bios supported it.