It could be a XP issue but first

XP's install is not for most of us. It may be time to move on if the owner does not want to ask HP how to install XP. Here's an example chat with HP.
http://forums.cnet.com/7726-7587_102-2699006.html

I don't want to upset you but XP is from a time long ago where folk put up with such nonsense. It's time to move on.
Bob