Check that there are no new USB 2.0 drivers for your computer in Windows Update. If updates are available please install them and try again.
If there are no updates, this error can also be caused by a problem with the computer’s power supply. It can usually be cleared with no side effects by shutting down the computer, physically unplugging the computer’s power cable from the mains socket and leaving it for at least 30 minutes to allow any remaining electrical charges to disperse. After that you can reconnect the computer and start it up again; the error should be gone. If this happens more than once it may be advisable to replace the computer’s power supply and mains cable.
One other cause of this problem could be that the system's USB drivers have stopped working. You can uninstall them in the Device Manager control panel. Windows should reinstall them when you next restart or you can install them manually from the computer manufacturer's website. If you try this please be careful to have a non-USB keyboard/mouse plugged in so that you can still use your keyboard/mouse in between.