ok, simple solution .
Do you have another PC? If you have,
Go toPassword Reset
Burn this program into a CD,
Run this CD into your "Lock" computer and it will reset your local password.
Remember to type in * for blank password....
After you have finished running the password reset,
Log in as per normal but normally user name is administrator.....you will know while running the program.
After logging in , check out user account at control panel. It depends on you to add user or remove user because your previous setting is still there, just that you do not have password to log in.
Any problem get back.......
Another way would be thru your Bios to reset the administrator password.
Worst way is pretty extreme, u dn have to reformat but to remove a "hardware" ( not advisable thou dats y i not telling here) inside your motherboard and it will reset the whole system with brand new log in and basic program settings only. ALL DATA IS WIPE OFF!!!! ...