I have just come accross this thread, and that is exactly what I have done... just yesterday. My router is working great on the PC, hard wired but the laptop pcmia card sort of gets up and running... and gets a great connection, but when I next strat up XP the whole thing dies on me, saying that there was a problem with a recent installation. Thereafter, putting in the card hangs... or at least immensely slows... everything on the laptop and the card doesn't get recognized properly.
To be fair, Belkin support did try hard to help, and we were getting down to "maybe your laptop is not getting enough power to the card" when suddenly it sprang into life... only to die again after I put the phoine down :(
So ... MAYBE it is my laptop, but we'll see when I try the US Robotics one this weekend. I'll let you know if it works better...