There are lots of instructions for solving this problem on Windows 7. However, it does depend upon whether this is a local account password or if the laptop belongs to a network, such as the school's, and it needs to be logged in to the domain. If it is a networked computer from a domain, you will need to conatct the domain admins/support to get your password reset. If it is a local account, please use your favorite search engine to search for "Windows password reset" - I am not much for recreating the wheel and there are any number of resources out there which have documented several different ways to do this, all with screen prints and comments.