Unfortunately Microsofts Knowledge Base has no info on this device. I do know that XP does have native support for scanners and cameras. Perhaps trying to run the scanner with the default XP drivers and another OCR application such as OmniPage. Be sure there is no instance of the HP software installed. If possible, run a restore to a date previous to your first installation of the HP drivers. Besides, OmniPage is a much better written program for scanners than what HP puts out. I own an All-in-One printer and the bundled OCR software is garbage but it interferes with any other OCR I use.
Anyway, good luck with this, the default Windows drivers SHOULD work, although you may not have ALL the functionality that the OEM drivers would provide.