Tried to install Talk Talk today for a friend, and USBs on back of computer now are not working. None of them work!!! Anyone know what I can do? They were working but all of a sudden stopped. There are 3 on the back of computer. Luckily there are 2 more on the side, so I can use the mouse. Not sure what to do to get the USBs on back working again? Any advice be great!