I'm having a similar problem. I'm also using the Clean Access Agent to connect to a school network, but I don't have a router. My connection is directly through a CATV cable from the wall to my laptop. Whenever I try to set up the USB Connector it tells me that I am not connected to the internet, even though I most definitely am. (a friend of mine set up the USB connector on their computer(a floor below me), also on the school network, successfully. he had no problems, but he also has a desktop..if that makes any difference)
Another thing, my laptop has recently stopped detecting any wireless signals at all and the wifi card seems to have stopped working, period. I turn it on and nothing happens(the light doesn't change from orange to blue).
In fact, NONE of my network connections show up in my Network Places, even the one i'm connected to right now.
I have a feeling I may need to reformat....:x
Any help for my many problems is appreciated.