My computer supports two Shuffles (but not at the same time). When they're plugged-in they don't show up in "My Computer" but in the Control Panel/System/Hardware/Device Manager they're recognized simply as "Apple iPod USB Device" with no driver installed. They, nonetheless, work just fine and are recognized by iTunes in its Source List. I wouldn't worry too much if your computer has a problem recognizing your Shuffle -- the important thing is to get it working with iTunes.
Roger