It sounds like the bearing pre-load is too tight. Kind of hard to diagnose over the internet.
If you are not familiar with setting the pre-load, I agree wholeheartedly with Venice.
If you feel up to it, try Sheldon's directions.
It is a good read and his links at the bottom will help you do it yourself if you want to.
Cone Adjustment
This link will get you right to the point:
Tool Tips--Cone Wrenches
This has to be done carefully for your own safety and enjoyment of your bike.