Without A Cracker N2o Is There A Password Cracker I Could Use Without Installation?

Is there a password cracker I could use without installation? - without a cracker n2o

I have heard my admin password, which I use on the account for my son. I can not remember your password but apparently has tried ophcrack hard, because I did not get. I can not forget to download a software to Vista I enter my password when I try to install it to recover. Are there any other password crackers, such as recovery programs ophcrack can install and use without anything? Help me please !!!!!!!!!