USB bandwidth reserves under XP

Is it possible to vary the 'fixed' amount of bandwidth that the system reserves for each USB port? I'm running a cable modem on USB, and also have a 4 USB port PCI card, and a MS keyboard with USB ports.

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Is it possible to vary the 'fixed' amount of bandwidth that the system reserves for each USB port?
I'm running a cable modem on USB, and also have a 4 USB port PCI card, and a MS keyboard with USB ports.
The Modem is plugged into USB 1, and the keyboard port is plugged into USB 2.
I have a USB mouse on the keyboard hub, and a ZIP drive (this gets swapped out with other devices sometimes)
There will only be a printer on the 4 port card.
 
I noticed that one of the USB ports (1 I think) has 20% of system bandwidth assigned to it, and all the others have 10%. Even when I only had the two ports by themselves, these percentages didn't change.
Disabling a couple of the Ports on the PCI card didn't do anything to this either.
Is there any way to reassign the resources so that the port with the Modem has a greater percentage of bandwidth reserved?
 
I tried to connect the modem via an ethernet NIC, but the software that came with the modem sulked, and refused to reasign DHCP IP addresses for it, which is why I went back to USB.
 
Am using Win XP home, with all service packs/updates.
Athlon 1100, 512 MB RAM.
Cable modem should be at 600K/s but usually only manages 200K. I have Norton Firewall and AV running, but disabling these doesn't seem to make a great difference to the speed.
 
Any help appreciated.

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