Don Firth said:

Unfortunately, when I received my nice, new HP Pavilion a few years ago, all the software I ordered had been pre-installed and they didn't send me the distribution disks.

It is my understanding that you are entitled to a distribution disk. At least when I needed to reinstall XP Pro on my Compaq tower, I called MicroHype support. When they found I had a Compaq, with XP Pro installed by the manufacturer or retailer, they told me that the version necessary was peculiar to Compaq, and they couldn't help me themselves, but they told me that Compaq had to give me a distribution disk free.   They gave me a support number, and indeed, Compaq did send me an XP Pro distribution disk, free.

If I were in your situation I'd call HP's support and ask for the distribution disk they didn't supply. I think you'll get it.

Dave Oesterreich