I have a Windows XP computer. There are 8 USB ports in the computer, and I have a 10-port hub plugged into one of the 8 original ports. Absolutely none of the ports work. They used to work, even after I used the hub. Just recently they decided not to work. I did not install any software or make any system changes that could have affected the ports. If I plug something into any of the ports, nothing happens. Although, I do get power out of the ports. For example, my 10-port hub has a red light that comes on when it is plugged into the computer. That light is on even though the computer will not recognize anything plugged into it.
^^This is the system I am using now, but the system with the USB problem is a Windows XP Media Center.