Why are new belts breaking immediately?

\015 I was given a Hoover widepath fold away. Why are belts breaking immediately? They break at the “driver” –motor?– part, not on the brush. They melt. There is only a peg to wrap the belt around — is there supposed to be some sort of wheel over the peg that drives the belt? Or can the brush be bad, becoming difficult to turn, thus locking down the belt which then burns and breaks – i did smell burn rubber!\015 – Hoover U5172900 Fold Away Widepath Bagless Upright Vacuum