argh... usb.... do you not have a network card in your computer?? if you do, swap over to it... now!!!!
a little bit of an explanation is
here but basically, the usb relies on the system resources of the pc- a recent game (eg half life2) will increase the usage here dramatically so it is a good idea to get onto ethernet if you can.
If you don't have a NIC installed, you can buy one for about £2.50 from sites such as
ebuyer,
dabs or
insight... well worth the investment!!