Trinity Rescue Kit

Trinity Rescue Kit, as the name suggests is a collection of many small & useful utilities which a System Administrator can use for diagnosis and troubleshooting purposes. Password Recovery is one of the many features it offers.
Using Trinity Rescue Kit, you can clear the password entirely making it blank or you can set a new custom password. Although it does not provide a Graphical User Interface but its very easy to use if you follow the instructions properly.
You can download the Trinity Rescue Kit ISO file and burn it to a CD/DVD or a flash drive and boot your computer from it. Trinity Rescue works with Windows XP, Windows Vista, Windows 7 and Windows 8.