hmmm did you install sp1 yet? if not try that
I have a P4, Intel 850G board, clean install of XP.
I have a Lexar USB "jump" drive. It does not appear in My Computer when connected although the system acknowledges that something is there. I can get it to mount if I restart with the device installed. But then, my sound doesn't work. Sound is on motherboard. USB 1.1 on motherboard, USB 2 on PCI card, same results. Also same with SONY similar drive.