The following video, along with links to the tool should help! Note it is Linux based.
Note this has the potential to render your system inoperable so be sure you know what you are doing! I highly suggest pointing this link to your computer technician, should you have troubles with passwords and ask them to help only to have them tell you that you are screwed! You aren't if you get them to follow this.
My website and the SOFTWARE/SUPPORT page can be quite possibly the most help you need so be sure to know what you are doing before digging yourself even deeper!
