Epson 2450 Failed on USB2.0, but not USB1.1

I installed the the XP USB 2.0 support driver which they have for Universal Serial Bus 2.0 Support in Windows XP (Q312370) as suggested by the information on the driver CD.
When I plugged my Epson 2450 scanner (It supports USB2) into a USB 1.1 onboard connector, XP could recognise it and it worked fine apart from XP was telling me that I have Hi-speed USB port available (which I have through MSI KT3 Ultra-ARU external bracket). The external bracket has 4 USB 2.0 ports, but Windows XP said I have 5. I don't get it.
Anyway, so I tried, unfortunately, when I plugged the scanner into USB2 connection. Windows XP did not recognise it and displayed it as a unknown device.
I try reinstall all the USB drivers, still does not work. MSI Australia said they use the Windows Update USB 2.0 driver with the external bracket at their office as well, but they have no USB 2.0 scanner to test.
They also asked me to try the driver that comes with the board on the CD (Directory USB\USB20\NEC\) even though it is intended for the use with other Windows operating systems instead of for Windows XP. But I tried, XP thought all the USB 2.0 ports of the bracket are USB 1.1, "Hi-speed device attached to non-hi-speed USB hub" appeared.
The following are what currently showing in my Device Manager under Universal Serial Bus Controllers:
NEC PCI to USB Enhanced Host Controller B1
NEC PCI to USB Open Host Controller
NEC PCI to USB Open Host Controller
USB 2.0 Root Hub
USB Printing Support
USB Root Hub
USB Root Hub
USB Root Hub
USB Root Hub
VIA Rev 5 or later USB Universal Host Controller
VIA Rev 5 or later USB Universal Host Controller
Could anyone help me to solve this problem, please. I have not heard from MSI Australia for days.

Thanks RLH. But I tried and made sure all that, No, still doesn't work.
MSI Australia sent me a USB 2.0 driver to test. The result was: XP only recognised the Epson 2450 scanner for 3 seconds, then the scanner under Imaging Devices of the Device Manager disappeared from viewing for 3 seconds, then it appeared back on again. But finally after a few continous flashing of Device Manager together with the scanner icon appearing and disappearing from Device Manager, XP said "Device not recognised" again.
Well, not the end of the story yet. after XP did not recognised the driver message appeared for about 5 seconds. XP then said it recognised the scanner, but it also displayed "Hi-Speed USB device attached to non-hi-speed hub" again. That means XP treated the USB 2.0 bracket as USB 1.1 again.
I tried Repairing XP, but...it's the same.
MSI Australia ask me to flash the BIOS, even though I am using version 5.4, not the latest 5.5 (which came out not long ago). I am yet to flash it, but I am not familiar with it. I need to research more before I flash the BIOS.
Anyway, MSI Australia said they are waiting for the propert USB 2.0 driver for the KT3 Ultra-ARU to come out. If (hopefully I don't need to wait for too long) the driver is released, they will send it to me.
It's not looking good.
What a pity that Epson 2450 is just an excellent scanner and I just can't use it to its full speed.
Regards

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