Go to control panel, then Hardware/Maintenance, then System. Go to the hardware tab, and Device manager. What you need to do is click on your USB controller, which should have a yellow exclamation point. itll bring up a properties window. Go to the drivers tab and click update drivers. Windows, if you have SP1 or 2, will automatically locate the USB 2.0 drivers and install them.
I had this same **** problem coupla days ago
Hope it helps,