Here I'll recommend you three way to find out your windows 7 password:
firstly,If you have left a hint when you created the password you can try enter the password a few times and the hint will appear (vista, windows 7) and might remind you what the password is.
secondly,If you have created a password reset disk before,you can recover the previous password with this disk.
thirdly,If you couldn't get back your account with those two methods above, then you'll have to use a software to get back your windows 7 password.
Enter a computer that can link to Internet. go to this web site to download a password recovery tool:
http://lost-password.net/products/wi...rdrecoery.html
With Windows Password Recovery tool, you can create a reset CD which can be multiple used to reset windows admin password without erasing anything.