firewire problem after Windows upgrade

> I've recently upgraded from XP-home to XP-pro, and wound
> up doing a "full install," so I lost data and
> applications. Now that the OS is loaded and stable, I'm
> getting a weird problem with IEEE1394 devices that I
> didn't have before the upgrade:
>
> 1. Before the upgrade, I plugged several IEEE1394 devices
> into a hub, and plugged the hub into one of the PC's
> firewire ports; all devices appeared in "My Computer"
> and "Device Manager." Now, XP doesn't see the devices if
> I go through the hub, but it does see them if I plug only
> one of them in to the PC and then daisy-chain the rest.
> Why?
>
> 2. One IEEE1394 device, however, is still unseen by
> Windows: a JVC HR-DVS2U mini-DV deck. Regardless of
> whether I plug it directly into the PC's firewire port,
> or daisy-chain it with the other IEEE1394 devices, it
> doesn't appear on "My Computer" or "Device Manager." I
> use the deck to capture video on Adobe Premiere, so it's
> essential I get this working again. Why does Windows not
> see this one IEEE1394 device?
>
> I've checked the firewire cables, and they're all good.