it's rather odd that it didn't apply a generic driver for it. XP comes with a healthy serving of them...weird
it may mean absolutely nothing, but i too have an HP scanner and if i remember correctly, there were special circumstances to avoid. With many of their scanners, they would conflict with HP printers also installed on the machine.
I read that you got the latest drivers for it, but did you try the old ones by any chance? Also, have you tried leaving it plugged in and doing a windows update? They will also search for new drivers for you automatically.
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