Your in a bit of a pickle.
The problem is this we don`t know if you are the true owner of the laptop.
If it has a password locking the hard drive from booting, then it was likely put on there in case the laptop was ever stolen to protect the information stored on it. If it is your laptop then it begs the question as to why you don`t know this password since you would of likely been the one to put it on the laptop.
It`s a case of phoning up the manufacturer of the laptop and providing them with details of where how and when you bought it by payment.
As no one will help you due to the reason i stated at the top of this post that it may be stolen.