Recover Windows Passwords

For some serious physical hacking, or if (in the unlikely scenario that) you honestly lost your Windows login password and would like to either retrieve it or reset it, I would recommend Ophcrack.

Ophcrack is a open source live CD, that you would need to download and burn, and then use it to boot up the PC, that requires its password reset/recovered.

Works with XP and Vista and can crack both LM, as well as NTLM passwords.