Try this:
Make sure that your Plug-and-Play Service is working and is running Automatically.
START >RUN > type services.msc
Once that is determined as Running | AUTOMATIC
Go to MyComputer > Right-Click PROPERTIES> Device Manager > scroll down to bottom where it says UNIVERSAL SERIAL BUS CONTROLLER.
Right-Click 2 or 3 (depending on how many USB ports your computer has)
USB Root HUB > Uninstall --> CONFIRM DEVICE UNINSTALL [OK]
SHUTDOWN the computer. Wait a minute. RESTART.
If you have SP3 installed, it will automatically find USB2 driver. In rare case you will have to manually re-direct the driver location (as I recently did ~ 4weeks ago)