Veets,
Had a similar problem with moving a HP Scan Jet from a Win98 SE machine to a new XP machine. The scanner worked fine on the W98 machine, never had a problem outside of it have a very slow TWAIN driver along with a slow USB 1.1 system.
After a wasted call to HP, seems there was a problem with that particular early XP driver, as I remember it failed to locate the USB port or never gave me the choice.
Tried removing the scanner and all drivers several times, got annoyed and D/L'ed the Win2K or WinMe driver set (was a while back, sorry).
Loaded those drivers and it detected the USB port and I had to manually configure the scanner.
I never really did get the front panel buttons to work at all on XP. I understand now that there are new XP drivers from HP which correct this problem. Will wait until I return to this machine to even consider deleting present drivers that work to gain a button feature that HP says they have fixed, which the owner never uses anyway.
That initial setup only lasted a month or so and had to redo it as it stopped working. It might be noted that Adobe Photo Works was installed right before it quit. My hunch with that was the HP software more than the driver. Reinstalled the driver and software and its been fine now for over a year or so. Still very slow on a USB 2.0 port.
HP interface software has always either been a snap to install or a major pain. Not sure why but it goes back to Dot Matrix printers, HP has never been driver friendly at all, in any OP system.
Not sure if this solved your problem, but you might keep trying and post back if you solve the problem so we all can see it.
Cheers
Good judgment comes from experience, and a lot of that comes from bad judgment..... Will Rogers