do you have a restore disc for that xp you could try to made a windows repair boot files .
I have a Recover Disc and a System Disc; I followed the steps so the computer sees the CD drive as first priority upon start up but nothing changed. I'm not overly tech savvy, especially regarding this type of computer, so forgive my ignorance.
It may just require a trip to a man with a computer shop. Or maybe I missed a key step..