Turn off computer.
Plug ipod into usb.
Then you must reset your ipod... don't worry it won't wipe anything out.
To reset move the hold button ( on top of the ipod) once to hold then back to original position.
Then press and hold the center button and the top menu button at the same time for 6 seconds.
Start computer and it should install the usb driver for the ipod automatically.
Your I pod will say do not unplug so don't. then open itunes and it will be there.
Just remember to not only eject ipod from itunes but stop usb.
Go to the program icons near the clock and right click the usb icon and "safely remove hardware" will appear and click it.
Stop it and select "apple ipod".