From the bikepedia site
http://www.bikepedia.com/quickbike/B...es+2&Type=bike
Your bike has an Alex hub. If your shop happens to have an Alex freehub that will swap out with yours (highly unlikely) it should be an easy, inexpensive swap. If not, get a new rear wheel. It's not worth buying a new hub and building it up with a 4000 mile old rim.
Just an FYI on the difference between a freewheel and a cassette freehub (you have a cassette)
http://www.sheldonbrown.com/free-k7.html