You can change your windows password without knowing your current password (Yeah, that's correct). You can always create a password reset disk to reset your password but, this trick does not need that you can reset windows password without any disk or current password. I don't know why Microsoft did that but it is here. I have tried these tricks on windows 7 and XP and they work on the both versions however I couldn't get them to work on windows 10, You can give them a go and if worked just let me know in the comment section.