I met the same difficulty for the previous period,and I know the easy
and effive method that you can use Windows Password Reset Deluxe to solve it by the Internet,while the use method is following.
Tip1
ownload Windows Password Reset Deluxe from
http/www.windowspassswordreset.net and install it on your computer.
Tip2:Burn Windows Password Reset to CD/DVD or USB.
Tip3:Insert newly created CD/DVD or USB to your computer which you forgot its password and reboot it,and follow the instruction that follows.
I hope it can help you soon.