"It would appear that only one slot/port is
USB 2.0 and the rest are 1.1 "
I see nothing in your post to indicate that.
You've got too many root hubs listed - there is only one.
There is one host controller for each pair of ports (3 for 6).
"I am using the VIA drivers for USB 2.0 which
apparently are only supposed to work in Win2K
and Win XP. However, I see these drivers
advertised as working in Win98SE on other
sites."
Where did you get that from? If you installed the Via mboard drivers from the CD that comes with the mboard, you probably already have Win98SE drivers installed.
If you don't think you do, go here for the AGP drivers
http://www.viaarena.com/?PageID=2
Or here for all the Via drivers.
(see the note about older op systems - use the older version)
They automatically install the right drivers for your chipset and your operating system.
http://www.viaarena.com/?PageID=300