Take it back to the pawnshop you purchased it from. If you're lucky, it's just a matter of them forgetting to give you the password. If not, you're SOL. As nukemaster states, it's against the forum rules to discuss bypassing security protocols, regardless of the situation.
Try and get a refund because the pawnshop basically sold you a non-functioning product.
The next time you buy a used laptop, make sure when you turn it on you can get into Windows, otherwise you would have simply just bought a technologically advanced brick.