If you have the other admin account than you can reset the main administrator password. If you don't have the other admin account than you can use the reset disk.
If you don't have the reset disk than you can use software called Password Resetter. The Main Purpose of this software is to remove ...
I have also lost my windows password and I hadn’t any other admin account than I used a reset disk from this amazing website. You can go here :
w w w r e s e t p a s s w o r d w i n d o w s c o m