Hi there!
I'm sorry to say but this communitiy is only targeted to users of NTRglobal products and related problems. For generic PC issues I suggest you try the usual places or google up "pc vista usb problems" for instance. Personally I recommend checking Experts Exchange (you cannot see the answers unless you register but if you google the exact question and choose show results in cache you normally can access them without registering).
My bet is that your usb driver has somehow become