My laptop has been acting weird the last few days. Recently, the worst problem is that the usb hub wont work, nor will any usb function. I have speakers powered by usb, which still works, but when I hook up a flash drive or wireless network (usb) thing, they dont connect or even power up. And the last day, the same thing has happened with my Vista (and my laptop is XP). I have no clue why this is doing this. I tried re-formatting my laptop and it still wont work. Any reasons why?

Did you try re-installing your USB drivers?