QNH
The USB appears to be enabled in the BIOS and a little test programme I downloaded says that it is supported and working, but there is no sign of it in the Device manager. Perhaps you could advise further.
FL310
I have been following the process you describe but it still won't detect new hardware. I suspect from QNH's reply for some reason it is not enabled in spite of the test programmes result. I have an Abit BH6 motherboard, with the 2nd Version of WIN98 if this is any help.