Slightly difficult to diagnose. One would be to re-install windows, to rule outs its not a software problem. If it still continues to not work, then it proberly is a fault with the USB ports - you dont mention if you have tried various external USB ports.
You can buy a PCMCIA usb card, to use has a workaround
howtomendit.com for free repair help, information and advice.
Try fixfault.com to fix notebooks/laptop pcs.