... bro try to check kong naka enable ba ang USB mo sa CMOS kung disable siya ehh paki enable nalang! check mo rin sa hardware device manager if your USB controller was installed correctly.
... if not try to download usb driver then install it...
... another thing you can do is to install your mothberboard DRIVERPACK!....
Baka naman corrupted ang installer mo ng itunes... mag download ka nalang ng bago....
thanks... hope this will help....